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Showing 301 - 320 of 501 results

An Experimental Method for Measuring Water Droplet Impingement Efficiency on Two- and Three-Dimensional Bodies

Papadakis, M. ;

Elangonan, R.

1989-11-01 | PDF

An experimental method was developed to determine the droplet impingement characteristics on 2-D and 3-D bodies. The experimental results provide the essential droplet impingement data required to validate water droplet trajectory codes, which are used in the analysis of aircraft icing. A body, whose water droplet impingement characteristics are re ...

08/10/2026

Title : An Experimental Method for Measuring Water Droplet Impingement Efficiency on Two- and Three-Dimensional Bodies Creator(s) : Papadakis, M.;Elangonan, R.;Freund, G. A., Jr.;Breer, M.;Zumwalt, G. W.;Whitmer, L.; Corporate Creator(s) : United States. National Aeronautics and Space Administration Corporate Contributor(s) : Lewis Research Center;United States. Department of Transportation. Federal Aviation Administration; Published Date : 1989-11-01 Report Number : DOT/FAA/CT-87/22 URL : https://rosap.ntl.bts.gov/view/dot/92921
Papadakis, M., Elangonan, R., Freund, G. A. J., Breer, M., Zumwalt, G. W., & Whitmer, L. (1989). An Experimental Method for Measuring Water Droplet Impingement Efficiency on Two- and Three-Dimensional Bodies (Report No. DOT/FAA/CT-87/22). United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. https://rosap.ntl.bts.gov/view/dot/92921

Papadakis, M., R. Elangonan, G. A., Jr. Freund, M. Breer, G. W. Zumwalt, and L. Whitmer. An Experimental Method for Measuring Water Droplet Impingement Efficiency on Two- and Three-Dimensional Bodies. Report no. DOT/FAA/CT-87/22. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1989. https://rosap.ntl.bts.gov/view/dot/92921.

Papadakis, M., et al. An Experimental Method for Measuring Water Droplet Impingement Efficiency on Two- and Three-Dimensional Bodies. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1989, Report no. DOT/FAA/CT-87/22, ROSA P. https://rosap.ntl.bts.gov/view/dot/92921.
Export RIS Citation Information. TY - Tech Report AU - Papadakis, M. AU - Elangonan, R. AU - Freund, G. A., Jr. AU - Breer, M. AU - Zumwalt, G. W. AU - Whitmer, L. A2 - United States. National Aeronautics and Space Administration A3 - Lewis Research Center A3 - United States. Department of Transportation. Federal Aviation Administration AB - An experimental method was developed to determine the droplet impingement characteristics on 2-D and 3-D bodies. The experimental results provide the essential droplet impingement data required to validate water droplet trajectory codes, which are used in the analysis of aircraft icing. A body, whose water droplet impingement characteristics are required, is covered at strategic locations by thin strips of moisture absorbing (blotter) paper, and is exposed to an air stream containing a water dye solution spray cloud. Water droplet impingement data are extracted from the dyed blotter strips by measuring the optical reflectance of the dye deposit on the strips, using an automated reflectometer. Models tested include a 4-inch diameter cylinder, a NACA 652015 airfoil section, a MS(1)-0317 supercritical airfoil section, three simulated ice shapes, an axisymmetric inlet and a Boeing 737-300 inlet model. Detailed descriptions of the dye tracer technique, instrumentation, data reduction method and the results obtained are presented. Analytical predictions of collection efficiency characteristics for most test configurations are included for comparison. AN - dot:92921 DA - 1989-11-01 ET - Contractor Report KW - Airplanes KW - Climate KW - Ice prevention KW - Mathematical models LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1989 SN - DOT/FAA/CT-87/22 TI - An Experimental Method for Measuring Water Droplet Impingement Efficiency on Two- and Three-Dimensional Bodies M3 - Tech Report N1 - United States N1 - NAG3-566 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92921 ER -
Avionics System Design for High Energy Fields

McConnell, R.

1988-07-01 | PDF

Because of the significant differences in transient susceptibility, the use of digital electronics in flight critical systems, and the reduced shielding effects of composite materials, there is a definite need to define design practices which will minimize electromagnetic susceptibility, to investigate the operational environment, and to develop ap ...

08/10/2026

Title : Avionics System Design for High Energy Fields Creator(s) : McConnell, R. Corporate Creator(s) : CK Consultants, Inc Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Technical Center Published Date : 1988-07-01 Report Number : DOT/FAA/CT-87/19 URL : https://rosap.ntl.bts.gov/view/dot/92920
McConnell, R. (1988). Avionics System Design for High Energy Fields (Report No. DOT/FAA/CT-87/19). United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. https://rosap.ntl.bts.gov/view/dot/92920

McConnell, R.. Avionics System Design for High Energy Fields. Report no. DOT/FAA/CT-87/19. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1988. https://rosap.ntl.bts.gov/view/dot/92920.

McConnell, R. Avionics System Design for High Energy Fields. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1988, Report no. DOT/FAA/CT-87/19, ROSA P. https://rosap.ntl.bts.gov/view/dot/92920.
Export RIS Citation Information. TY - Tech Report AU - McConnell, R. A2 - CK Consultants, Inc A3 - United States. Department of Transportation. Federal Aviation Administration. Technical Center AB - Because of the significant differences in transient susceptibility, the use of digital electronics in flight critical systems, and the reduced shielding effects of composite materials, there is a definite need to define design practices which will minimize electromagnetic susceptibility, to investigate the operational environment, and to develop appropriate testing methods or flight critical systems. AN - dot:92920 DA - 1988-07-01 ET - Final Report KW - Aeronautics KW - Air traffic control KW - Electromagnetic compatibility KW - Electromagnetic interference KW - Electronic equipment KW - Electronics LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1988 SN - DOT/FAA/CT-87/19 TI - Avionics System Design for High Energy Fields M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92920 ER -
Transverse Cracking of Asphalt Pavements

Shelquist, Robert A. ;

O'Connor, Edward J.

1982-07-01 | PDF

This report summarizes the analysis of transverse cracking in asphalt pavement by a five state study team from Iowa, Kansas, Nebraska, North Dakota, and Oklahoma. The study was initiated under the sponsorship of the Federal Highway Administration and four evaluation conferences were held during the course of the study. Each state conducted a crack ...

08/10/2026

Title : Transverse Cracking of Asphalt Pavements Creator(s) : Shelquist, Robert A.;O'Connor, Edward J.;Jordison, Donald D.;Marks, Vernon J.;Maag, Rodney G.;Wallace, Harvey E.;Baty, Montie W.;Silenieks, Janis;Wedner, Robert J.;Heedum, Roland H.;Peterson, Robert T.;Mandy, Jack;Horner, Jerry;Philliber, Wayne;Golden, David;Crenshaw, Harold;Edwards, Warren L.;Johnson, Edward D.;Bova, Raymond;Burton, James A.; Corporate Creator(s) : Iowa. Department of Transportation;Kansas. Department of Transportation;Nebraska. Department of Roads;North Dakota. State Highway Department;Oklahoma. Department of Transportation;United States. Department of Transportation. Federal Highway Administration;Asphalt Institute; Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration. Office of Research and Development;United States. Department of Transportation. Federal Highway Administration. Turner-Fairbank Highway Research Center; Published Date : 1982-07-01 Report Number : FHWA-TS-82-205 URL : https://rosap.ntl.bts.gov/view/dot/92919
Shelquist, R. A., O'Connor, E. J., Jordison, D. D., Marks, V. J., Maag, R. G., Wallace, H. E., Baty, M. W., Silenieks, J., Wedner, R. J., Heedum, R. H., Peterson, R. T., Mandy, J., Horner, J., Philliber, W., Golden, D., Crenshaw, H., Edwards, W. L., Johnson, E. D., Bova, R., & Burton, J. A. (1982). Transverse Cracking of Asphalt Pavements (Report No. FHWA-TS-82-205). United States. Department of Transportation. Federal Highway Administration. Office of Research and Development. https://rosap.ntl.bts.gov/view/dot/92919

Shelquist, Robert A., Edward J. O'Connor, Donald D. Jordison, Vernon J. Marks, Rodney G. Maag, Harvey E. Wallace, and Montie W. Baty, et al.. Transverse Cracking of Asphalt Pavements. Report no. FHWA-TS-82-205. United States. Department of Transportation. Federal Highway Administration. Office of Research and Development, 1982. https://rosap.ntl.bts.gov/view/dot/92919.

Shelquist, Robert A., et al. Transverse Cracking of Asphalt Pavements. United States. Department of Transportation. Federal Highway Administration. Office of Research and Development, 1982, Report no. FHWA-TS-82-205, ROSA P. https://rosap.ntl.bts.gov/view/dot/92919.
Export RIS Citation Information. TY - Tech Report AU - Shelquist, Robert A. AU - O'Connor, Edward J. AU - Jordison, Donald D. AU - Marks, Vernon J. AU - Maag, Rodney G. AU - Wallace, Harvey E. AU - Baty, Montie W. AU - Silenieks, Janis AU - Wedner, Robert J. AU - Heedum, Roland H. AU - Peterson, Robert T. AU - Mandy, Jack AU - Horner, Jerry AU - Philliber, Wayne AU - Golden, David AU - Crenshaw, Harold AU - Edwards, Warren L. AU - Johnson, Edward D. AU - Bova, Raymond AU - Burton, James A. A2 - Iowa. Department of Transportation A2 - Kansas. Department of Transportation A2 - Nebraska. Department of Roads A2 - North Dakota. State Highway Department A2 - Oklahoma. Department of Transportation A2 - United States. Department of Transportation. Federal Highway Administration A2 - Asphalt Institute A3 - United States. Department of Transportation. Federal Highway Administration. Office of Research and Development A3 - United States. Department of Transportation. Federal Highway Administration. Turner-Fairbank Highway Research Center AB - This report summarizes the analysis of transverse cracking in asphalt pavement by a five state study team from Iowa, Kansas, Nebraska, North Dakota, and Oklahoma. The study was initiated under the sponsorship of the Federal Highway Administration and four evaluation conferences were held during the course of the study. Each state conducted a crack inventory on their asphalt pavement. An effort was made to correlate this inventory with numerous factors that were considered to be pertinent to the cracking problem. One state did indicate that there was a correlation between transverse cracking severity and the subsurface geology. The other states were unable to identify any significant factors as being the primary contributors. The analysis of the problem was divided into, (1) mix design, (2) maintenance, and (3) 3R rehabilitation. Many potential factors to be considered were identified under each of these three study divisions. There were many conclusions as to good and bad practices. One major conclusions was that a more effective crack maintenance program with early sealing was essential. Some new practices were suggested as potentially more cost effective in design, construction and maintenance. The interchange of methods and procedures by individual states yielded benefits in that other states selected practices that would be an improvement to their program. AN - dot:92919 DA - 1982-07-01 KW - Asphalt pavements KW - Transverse cracking KW - Pavement maintenance KW - Geological surveying KW - Mix design KW - Rehabilitation LA - English PB - United States. Department of Transportation. Federal Highway Administration. Office of Research and Development PY - 1982 SN - FHWA-TS-82-205 TI - Transverse Cracking of Asphalt Pavements M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92919 ER -
Current Fire Safety Design Aspects of Commuter Aircraft

Clarke, Richard ;

Kane, Deborah

1988-03-01 | PDF

This study describes Fire Safety systems, cabin design and materials in cabin areas of ten common commuter aircraft. The aircraft were selected based upon a balance of current population and aircraft most commonly delivered. These aircraft represent 880 of 1100 commuter aircraft and probably will be the majority of the commuter fleet in the future.

08/10/2026

Title : Current Fire Safety Design Aspects of Commuter Aircraft Creator(s) : Clarke, Richard;Kane, Deborah;Stewart, Carla; Corporate Creator(s) : Events Analysis, Inc Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Technical Center Published Date : 1988-03-01 Report Number : DOT/FAA/CT-87/32 URL : https://rosap.ntl.bts.gov/view/dot/92918
Clarke, R., Kane, D., & Stewart, C. (1988). Current Fire Safety Design Aspects of Commuter Aircraft (Report No. DOT/FAA/CT-87/32). United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. https://rosap.ntl.bts.gov/view/dot/92918

Clarke, Richard, Deborah Kane, and Carla Stewart. Current Fire Safety Design Aspects of Commuter Aircraft. Report no. DOT/FAA/CT-87/32. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1988. https://rosap.ntl.bts.gov/view/dot/92918.

Clarke, Richard, et al. Current Fire Safety Design Aspects of Commuter Aircraft. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1988, Report no. DOT/FAA/CT-87/32, ROSA P. https://rosap.ntl.bts.gov/view/dot/92918.
Export RIS Citation Information. TY - Tech Report AU - Clarke, Richard AU - Kane, Deborah AU - Stewart, Carla A2 - Events Analysis, Inc A3 - United States. Department of Transportation. Federal Aviation Administration. Technical Center AB - This study describes Fire Safety systems, cabin design and materials in cabin areas of ten common commuter aircraft. The aircraft were selected based upon a balance of current population and aircraft most commonly delivered. These aircraft represent 880 of 1100 commuter aircraft and probably will be the majority of the commuter fleet in the future. AN - dot:92918 DA - 1988-03-01 ET - Final Report KW - Aircraft KW - Commuting KW - Fire resistance KW - Materials KW - Vehicle safety LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1988 SN - DOT/FAA/CT-87/32 TI - Current Fire Safety Design Aspects of Commuter Aircraft M3 - Tech Report N1 - United States N1 - DTFA03-86-C-00062 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92918 ER -
An Evaluation of the Calderon Test

Csanyi, Ladis H. ;

Gumbert, Robert L.

1963-07-01 | PDF

The purposes of this project are threefold. First, to ascertain how the Calderon test might be used in testing Iowa Type A asphaltic concrete mixes. Second, to determine whether or not the Calderon test may be correlated with the Iowa Stability, the Marshall Stability, or the Hveem Stability tests. Third, to establish, if possible, mix design crite ...

08/10/2026

Title : An Evaluation of the Calderon Test Creator(s) : Csanyi, Ladis H.;Gumbert, Robert L.; Corporate Creator(s) : Iowa State University of Science and Technology Corporate Contributor(s) : Iowa Highway Research Board Published Date : 1963-07-01 Report Number : 442-S URL : https://rosap.ntl.bts.gov/view/dot/92917
Csanyi, L. H., & Gumbert, R. L. (1963). An Evaluation of the Calderon Test (Report No. 442-S). Iowa Highway Research Board. https://rosap.ntl.bts.gov/view/dot/92917

Csanyi, Ladis H. and Robert L. Gumbert. An Evaluation of the Calderon Test. Report no. 442-S. Iowa Highway Research Board, 1963. https://rosap.ntl.bts.gov/view/dot/92917.

Csanyi, Ladis H., and Robert L. Gumbert An Evaluation of the Calderon Test. Iowa Highway Research Board, 1963, Report no. 442-S, ROSA P. https://rosap.ntl.bts.gov/view/dot/92917.
Export RIS Citation Information. TY - Tech Report AU - Csanyi, Ladis H. AU - Gumbert, Robert L. A2 - Iowa State University of Science and Technology A3 - Iowa Highway Research Board AB - The purposes of this project are threefold. First, to ascertain how the Calderon test might be used in testing Iowa Type A asphaltic concrete mixes. Second, to determine whether or not the Calderon test may be correlated with the Iowa Stability, the Marshall Stability, or the Hveem Stability tests. Third, to establish, if possible, mix design criteria for the Calderon test in relation to Iowa Type A asphaltic concrete mixes. AN - dot:92917 DA - 1963-07-01 KW - Alternatives analysis KW - Asphalt cement KW - Bituminous mixtures KW - Coarse aggregates KW - Coefficient of internal friction KW - Compression KW - Pendulum tests KW - Evaluation KW - Mix design KW - Shear strength KW - Marshall test LA - English PB - Iowa Highway Research Board PY - 1963 SN - 442-S TI - An Evaluation of the Calderon Test M3 - Tech Report N1 - United States N1 - H.R. 80 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92917 ER -
Traffic Forecasting for Pavement Design

Desai, Harshad ;

Reel, Rick

1986-12-01 | PDF

The need for improved traffic estimation procedures has been emphasized by several studies that demonstrated that previously available data were not adequate. Some data were not considered representative of actual traffic conditions because of overloaded trucks avoiding weighing scales and insufficient traffic sampling programs. In addition, previo ...

08/10/2026

Title : Traffic Forecasting for Pavement Design Creator(s) : Desai, Harshad;Reel, Rick;Deen, R.;Tabery, Vernon L.;Noble, Ronald;Hallenbeck, Mark;Crimmins, Dennis;Cunagin, Wiley; Corporate Creator(s) : Florida. Department of Transportation;Kentucky. Transportation Cabinet;Oregon. Department of Transportation;Washington (State). Department of Transportation;Texas Transportation Institute; Corporate Contributor(s) : United States. Federal Highway Administration. Office of Implementation;United States. Department of Transportation. Federal Highway Administration. Turner-Fairbank Highway Research Center; Contributor(s) : Brown, Douglas Published Date : 1986-12-01 Report Number : FHWA-TS-86-225 URL : https://rosap.ntl.bts.gov/view/dot/92916
Desai, H., Reel, R., Deen, R., Tabery, V. L., Noble, R., Hallenbeck, M., Crimmins, D., & Cunagin, W. (1986). Traffic Forecasting for Pavement Design (Report No. FHWA-TS-86-225). United States. Federal Highway Administration. Office of Implementation. https://rosap.ntl.bts.gov/view/dot/92916

Desai, Harshad, Rick Reel, R. Deen, Vernon L. Tabery, Ronald Noble, Mark Hallenbeck, Dennis Crimmins, and Wiley Cunagin. Traffic Forecasting for Pavement Design. Report no. FHWA-TS-86-225. United States. Federal Highway Administration. Office of Implementation, 1986. https://rosap.ntl.bts.gov/view/dot/92916.

Desai, Harshad, et al. Traffic Forecasting for Pavement Design. United States. Federal Highway Administration. Office of Implementation, 1986, Report no. FHWA-TS-86-225, ROSA P. https://rosap.ntl.bts.gov/view/dot/92916.
Export RIS Citation Information. TY - Tech Report AU - Desai, Harshad AU - Reel, Rick AU - Deen, R. AU - Tabery, Vernon L. AU - Noble, Ronald AU - Hallenbeck, Mark AU - Crimmins, Dennis AU - Cunagin, Wiley A2 - Florida. Department of Transportation A2 - Kentucky. Transportation Cabinet A2 - Oregon. Department of Transportation A2 - Washington (State). Department of Transportation A2 - Texas Transportation Institute A3 - United States. Federal Highway Administration. Office of Implementation A3 - United States. Department of Transportation. Federal Highway Administration. Turner-Fairbank Highway Research Center A4 - Brown, Douglas J. AB - The need for improved traffic estimation procedures has been emphasized by several studies that demonstrated that previously available data were not adequate. Some data were not considered representative of actual traffic conditions because of overloaded trucks avoiding weighing scales and insufficient traffic sampling programs. In addition, previous forecasting procedures did not reflect the increases in legal load limits, the significant increase in the number of heavy trucks, or the shift toward larger vehicle types that has occurred in recent years. Improved estimates of current traffic loadings based on larger samples of much higher quality data would allow development of procedures for making improved estimates of historical traffic loadings and better forecasts of traffic loadings during the design period. The emergence of automatic vehicle classification equipment, permanent and portable weigh-in-motion (WIM) systems, and the application of microprocessors and microcomputers to these data acquisition functions now offer tools that may be used effectively in meeting these needs. Representatives from four states (Florida, Kentucky, Oregon and Washington) met on several occasions to discuss the subject of traffic forecasting for pavement design. Information was compiled on all aspects of the traffic forecasting process, options were presented for each step of the process, and recommendations were developed to assist highway agencies in improving current practices and procedures. AN - dot:92916 DA - 1986-12-01 ET - Final Report KW - Forecasting KW - Algorithms KW - Pavement design KW - Traffic forecasting KW - Annual average daily traffic LA - English PB - United States. Federal Highway Administration. Office of Implementation PY - 1986 SN - FHWA-TS-86-225 TI - Traffic Forecasting for Pavement Design M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92916 ER -
Fargo-Moorhead Metro Traffic Data Collection and Reporting - Phase II

Sharma, Kshitij

2024-09-01 | PDF

For the current Phase II project, 42 additional intersections were set up for data collection and analysis, bringing the total area locations reporting data to more than 70 (considering those from NDDOT as well). The intersections for each agency are listed in tables below. Note again that similar to the pilot project, this phase of traffic data co ...

08/10/2026

Title : Fargo-Moorhead Metro Traffic Data Collection and Reporting - Phase II Creator(s) : Sharma, Kshitij Corporate Creator(s) : Upper Great Plains Transportation Institute Corporate Contributor(s) : Fargo-Moorhead Metropolitan Council of Governments Published Date : 2024-09-01 URL : https://rosap.ntl.bts.gov/view/dot/92915
Sharma, K. (2024). Fargo-Moorhead Metro Traffic Data Collection and Reporting - Phase II. Upper Great Plains Transportation Institute. https://rosap.ntl.bts.gov/view/dot/92915

Sharma, Kshitij. Fargo-Moorhead Metro Traffic Data Collection and Reporting - Phase II. Upper Great Plains Transportation Institute, 2024. https://rosap.ntl.bts.gov/view/dot/92915.

Sharma, Kshitij Fargo-Moorhead Metro Traffic Data Collection and Reporting - Phase II. Upper Great Plains Transportation Institute, 2024, ROSA P. https://rosap.ntl.bts.gov/view/dot/92915.
Export RIS Citation Information. TY - Tech Report AU - Sharma, Kshitij A2 - Upper Great Plains Transportation Institute A3 - Fargo-Moorhead Metropolitan Council of Governments AB - For the current Phase II project, 42 additional intersections were set up for data collection and analysis, bringing the total area locations reporting data to more than 70 (considering those from NDDOT as well). The intersections for each agency are listed in tables below. Note again that similar to the pilot project, this phase of traffic data collection and reporting used already-existing infrastructure without the need to purchase or maintain any additional traffic data collection devices. The mostly under-utilized or un-utilized capabilities of the existing transportation infrastructure devices combined with UGPTI's capabilities and innovative approach have made it possible to gather traffic data 24 hours per day, 7 days per week, and 365 days per year. AN - dot:92915 DA - 2024-09-01 ET - Final Report KW - Data collection KW - Signalized intersections KW - Traffic data KW - Data quality KW - Pedestrian counts KW - Reports KW - Data analysis KW - Infrastructure KW - Data collection KW - Signalized intersections KW - Traffic data LA - English PB - Upper Great Plains Transportation Institute PY - 2024 TI - Fargo-Moorhead Metro Traffic Data Collection and Reporting - Phase II M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92915 ER -
Considerations for Vehicles With Automated Driving Systems: Seating Preference Study

Anderson, G. T. ;

Klauer, S. G.

2026-08-01 | PDF

This VTTI study examined passenger seat belt behavior and seating preference in ADS-DVs with different seating arrangements: conventional, conventional with no manually operated controls, and an unconventional layout with a rear-facing and a forward-facing row of seats. They were recruited under the guise of testing rideshare applications in those ...

08/10/2026

Title : Considerations for Vehicles With Automated Driving Systems: Seating Preference Study Creator(s) : Anderson, G. T.;Klauer, S. G.;Radlbeck, J.;Trimble, T.; Corporate Creator(s) : Virginia Tech Transportation Institute Corporate Contributor(s) : United States. Department of Transportation. National Highway Traffic Safety Administration. Office of Vehicle Safety Research Published Date : 2026-08-01 Report Number : DOT HS 813 793 DOI : https://doi.org/10.21949/8e2a-pa23
Anderson, G. T., Klauer, S. G., Radlbeck, J., & Trimble, T. (2026). Considerations for Vehicles With Automated Driving Systems: Seating Preference Study (Report No. DOT HS 813 793). United States. Department of Transportation. National Highway Traffic Safety Administration. https://doi.org/10.21949/8e2a-pa23

Anderson, G. T., S. G. Klauer, J. Radlbeck, and T. Trimble. Considerations for Vehicles With Automated Driving Systems: Seating Preference Study. Report no. DOT HS 813 793. United States. Department of Transportation. National Highway Traffic Safety Administration, 2026. https://doi.org/10.21949/8e2a-pa23.

Anderson, G. T., et al. Considerations for Vehicles With Automated Driving Systems: Seating Preference Study. United States. Department of Transportation. National Highway Traffic Safety Administration, 2026, Report no. DOT HS 813 793, ROSA P. https://doi.org/10.21949/8e2a-pa23.
Export RIS Citation Information. TY - Tech Report AU - Anderson, G. T. AU - Klauer, S. G. AU - Radlbeck, J. AU - Trimble, T. A2 - Virginia Tech Transportation Institute A3 - United States. Department of Transportation. National Highway Traffic Safety Administration. Office of Vehicle Safety Research AB - This VTTI study examined passenger seat belt behavior and seating preference in ADS-DVs with different seating arrangements: conventional, conventional with no manually operated controls, and an unconventional layout with a rear-facing and a forward-facing row of seats. They were recruited under the guise of testing rideshare applications in those three vehicles. Seat belt buckling was observed, with all passengers buckled in prior to requesting to start the ride on 94% of trips. Results also showed passengers preferred sitting in the front row in a conventional vehicle or in forward-facing seats of an unconventional seating layout. AN - dot:92914 DA - 2026-08-01 DO - https://doi.org/10.21949/8e2a-pa23 KW - Automated vehicle control KW - Driving automation levels KW - Level 4 driving automation KW - Seat belt use KW - Seats KW - SAE Level 4 KW - ADS-DV KW - ADS-dedicated vehicle KW - Seating preference LA - English PB - United States. Department of Transportation. National Highway Traffic Safety Administration PY - 2026 SN - DOT HS 813 793 TI - Considerations for Vehicles With Automated Driving Systems: Seating Preference Study M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92914 ER -
Development of a Non-Destructive Imaging Tool to Identify Deficiencies in External Tendons Containing Flexible Fillers

Alexander, Christopher L. ;

Sagüés, Alberto A.

2026-07-01 | PDF

The University of South Florida's Corrosion Research Laboratory previously developed a tendon imaging unit (TIU) capable of providing representative cross-section images of external tendons that show strand envelope position and the likelihood of grouting deficiencies. The objective of this work was to adapt the grout-based TIU for application to w ...

08/10/2026

Title : Development of a Non-Destructive Imaging Tool to Identify Deficiencies in External Tendons Containing Flexible Fillers Creator(s) : Alexander, Christopher L.;Sagüés, Alberto A.;Karki, Mahesh;Kandel, Laxmi; Corporate Creator(s) : University of South Florida. Department of Civil and Environmental Engineering Corporate Contributor(s) : Florida. Department of Transportation Published Date : 2026-07-01 URL : https://rosap.ntl.bts.gov/view/dot/92913
Alexander, C. L., Sagüés, A. A., Karki, M., & Kandel, L. (2026). Development of a Non-Destructive Imaging Tool to Identify Deficiencies in External Tendons Containing Flexible Fillers. Florida. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/92913

Alexander, Christopher L., Alberto A. Sagüés, Mahesh Karki, and Laxmi Kandel. Development of a Non-Destructive Imaging Tool to Identify Deficiencies in External Tendons Containing Flexible Fillers. Florida. Department of Transportation, 2026. https://rosap.ntl.bts.gov/view/dot/92913.

Alexander, Christopher L., et al. Development of a Non-Destructive Imaging Tool to Identify Deficiencies in External Tendons Containing Flexible Fillers. Florida. Department of Transportation, 2026, ROSA P. https://rosap.ntl.bts.gov/view/dot/92913.
Export RIS Citation Information. TY - Tech Report AU - Alexander, Christopher L. AU - Sagüés, Alberto A. AU - Karki, Mahesh AU - Kandel, Laxmi A2 - University of South Florida. Department of Civil and Environmental Engineering A3 - Florida. Department of Transportation AB - The University of South Florida's Corrosion Research Laboratory previously developed a tendon imaging unit (TIU) capable of providing representative cross-section images of external tendons that show strand envelope position and the likelihood of grouting deficiencies. The objective of this work was to adapt the grout-based TIU for application to wax-filled external tendons. After characterization of the electrical properties of FDOT approved waxes, it became apparent that adaptation to wax-filled tendons would require sophisticated signal analysis to account for the limited difference between the dielectric constant for wax and air. An analysis approach was developed in which the magnetic signal is converted to a representative impedance signal considering a flaw-free, completely wax-filled condition. Comparison between the magnetic-signal recovered impedance and the measured impedance facilitates deficiency detection. Air void and water pocket deficiency detection with cross-section image recovery was demonstrated for a series of strand configurations and fill conditions. In a parallel thrust, an initial design for a rotation-free TIU was developed, and preliminary testing confirmed the capability of recovering strand position. This is a particularly promising advancement that with further development could result in increased ability to rapidly scan external tendons to facilitate bridge-scale testing or monitoring systems. AN - dot:92913 DA - 2026-07-01 ET - Draft Final Report: 03/15/2024 - 07/31/2026 KW - Reconstruction KW - Magnets KW - Sensors KW - Mechanical impedance KW - Testing KW - Monitoring KW - Fillers KW - Bridge design KW - Image reconstruction KW - magnetic sensor KW - impedance KW - convolution LA - English PB - Florida. Department of Transportation PY - 2026 TI - Development of a Non-Destructive Imaging Tool to Identify Deficiencies in External Tendons Containing Flexible Fillers M3 - Tech Report N1 - United States N1 - BED25-977-20 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92913 ER -
Bond Performance Between Precast UHPC Substrates and Field-Cast UHPC Connections

Lau, Kingsley ;

Permeh, Samanbar

2026-06-01 | PDF

Ultra-high performance concrete (UHPC) has been used in different applications and was explored to be used for precast elements; however, there was limited research and guidance on the connection between UHPC elements. General test methods to evaluate interface strength (e.g., direct tension pulloff, shear pushoff) can be used with the Mohr-Coulomb ...

08/10/2026

Title : Bond Performance Between Precast UHPC Substrates and Field-Cast UHPC Connections Creator(s) : Lau, Kingsley;Permeh, Samanbar;Garber, David; Corporate Creator(s) : Florida International University Corporate Contributor(s) : Florida. Department of Transportation Published Date : 2026-06-01 URL : https://rosap.ntl.bts.gov/view/dot/92912
Lau, K., Permeh, S., & Garber, D. (2026). Bond Performance Between Precast UHPC Substrates and Field-Cast UHPC Connections. Florida. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/92912

Lau, Kingsley, Samanbar Permeh, and David Garber. Bond Performance Between Precast UHPC Substrates and Field-Cast UHPC Connections. Florida. Department of Transportation, 2026. https://rosap.ntl.bts.gov/view/dot/92912.

Lau, Kingsley, et al. Bond Performance Between Precast UHPC Substrates and Field-Cast UHPC Connections. Florida. Department of Transportation, 2026, ROSA P. https://rosap.ntl.bts.gov/view/dot/92912.
Export RIS Citation Information. TY - Tech Report AU - Lau, Kingsley AU - Permeh, Samanbar AU - Garber, David A2 - Florida International University A3 - Florida. Department of Transportation AB - Ultra-high performance concrete (UHPC) has been used in different applications and was explored to be used for precast elements; however, there was limited research and guidance on the connection between UHPC elements. General test methods to evaluate interface strength (e.g., direct tension pulloff, shear pushoff) can be used with the Mohr-Coulomb Friction Approach to determine the cohesion coefficient and coefficient of friction typically used to estimate interface shear strength. The test program here sought to explore the bond behavior of matchcast UHPC with various interface surface conditions, such as surface roughness (including smooth faces cast on plywood formwork, roughened surfaces created by casting on form liners) and exposed steel fibers at the interface (created by the use of paste retarders) in order to inform design provisions for matchcast UHPC. The effect of pre-corroded steel fibers and the surface wetting conditions were considered as well. Trends in interface shear behavior associated with surface conditions were identified. The most evident outcome from testing was that the presence of exposed steel fibers provided improved performance relative to only roughened surfaces. Roughened interfaces can improve the friction of the interface, but the presence of the exposed fibers improved both cohesive strength and provided improvement to the post-crack tensile strength. Additionally, there was improved cohesive bonding when prolonged wetting by burlap was made. Extended term ponding had reduced performance. Cohesion coefficient and friction factors for the various test conditions were assessed. Modification to interface shear strength provisions to include the effect of wetting conditions on cohesion was presented. The experimental work provided practical experiences that were translated into considerations for construction. AN - dot:92912 DA - 2026-06-01 ET - Draft Final Report: February 2022 - June 2026 KW - Ultra high performance concrete KW - Shear properties KW - Interfaces KW - Casting KW - Precast concrete KW - Fibers KW - Corrosion KW - Wetting KW - Bonding KW - Structural connection KW - Interface Shear KW - Match LA - English PB - Florida. Department of Transportation PY - 2026 TI - Bond Performance Between Precast UHPC Substrates and Field-Cast UHPC Connections M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92912 ER -
An Experimental and Theoretical Study of the Ice Accretion Process During Artificial and Natural Icing Conditions

Kirby, Mark S. ;

Hansman, R. John

1988-04-01 | PDF

Real-time measurements of ice growth during artificial and natural icing conditions were conducted using an ultrasonic pulse-echo technique. This technique allows ice thickness to be measured with an accuracy of + or - 0.5 mm; in addition, the ultrasonic signal characteristics may be used to detect the presence of liquid on the ice surface and henc ...

08/10/2026

Title : An Experimental and Theoretical Study of the Ice Accretion Process During Artificial and Natural Icing Conditions Creator(s) : Kirby, Mark S.;Hansman, R. John; Corporate Creator(s) : Massachusetts Institute of Technology Corporate Contributor(s) : Lewis Research Center;United States. National Aeronautics and Space Administration; Published Date : 1988-04-01 Report Number : DOTIFAAICT-87117 URL : https://rosap.ntl.bts.gov/view/dot/92911
Kirby, M. S., & Hansman, R. J. (1988). An Experimental and Theoretical Study of the Ice Accretion Process During Artificial and Natural Icing Conditions (Report No. DOTIFAAICT-87117). United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. https://rosap.ntl.bts.gov/view/dot/92911

Kirby, Mark S. and R. John Hansman. An Experimental and Theoretical Study of the Ice Accretion Process During Artificial and Natural Icing Conditions. Report no. DOTIFAAICT-87117. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1988. https://rosap.ntl.bts.gov/view/dot/92911.

Kirby, Mark S., and R. John Hansman An Experimental and Theoretical Study of the Ice Accretion Process During Artificial and Natural Icing Conditions. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1988, Report no. DOTIFAAICT-87117, ROSA P. https://rosap.ntl.bts.gov/view/dot/92911.
Export RIS Citation Information. TY - Tech Report AU - Kirby, Mark S. AU - Hansman, R. John A2 - Massachusetts Institute of Technology A3 - Lewis Research Center A3 - United States. National Aeronautics and Space Administration AB - Real-time measurements of ice growth during artificial and natural icing conditions were conducted using an ultrasonic pulse-echo technique. This technique allows ice thickness to be measured with an accuracy of + or - 0.5 mm; in addition, the ultrasonic signal characteristics may be used to detect the presence of liquid on the ice surface and hence discern wet and dry ice growth behavior. Ice growth was measured on the stagnation line of a cylinder exposed to artificial icing conditions in the NASA Lewis Icing Research Tunnel (IRT), and similarly for a cylinder exposed in flight to natural icing conditions. Ice thickness was observed to increase approximately linearly with exposure time during the initial icing period. The ice accretion rate was found to vary with cloud temperature during wet ice growth, and liquid runback from the stagnation region was inferred. A steady-state energy balance model for the icing surface was used to compare heat transfer characteristics for IRT and natural icing conditions. Ultrasonic measurements of wet and dry ice growth observed in the IRT and in flight were compared with icing regimes predicted by a series of heat transfer coefficients. The heat transfer magnitude was generally inferred to be higher for the IRT than for the natural icing conditions encountered in flight. An apparent variation in the heat transfer magnitude was also observed for flights conducted through different natural icing-cloud formations. AN - dot:92911 DA - 1988-04-01 KW - Icing KW - Ice formations KW - Flight tests KW - Water vapor KW - Ultrasonics KW - Ice accretion LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1988 SN - DOTIFAAICT-87117 TI - An Experimental and Theoretical Study of the Ice Accretion Process During Artificial and Natural Icing Conditions M3 - Tech Report N1 - United States N1 - NAG3-666 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92911 ER -
The Effect of Weathering on Octane Quality for Winter-Grade and Summer-Grade Gasolines

Wares, Richard N.

1987-12-01 | PDF

Weathering tests were conducted to examine the effects on fuel volatility and octane characteristics. The commercially available gasolines utilized in the study represented a wide geographic distribution for both winter and summer fuels. Aging was accomplished by heating the fuel samples to 110 degrees F and maintaining that temperature for 48 hour ...

08/10/2026

Title : The Effect of Weathering on Octane Quality for Winter-Grade and Summer-Grade Gasolines Creator(s) : Wares, Richard N. Corporate Creator(s) : National Institute for Petroleum and Energy Research (NIPER}) Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Technical Center Published Date : 1987-12-01 Report Number : DOT/FAA/CT-87/16 URL : https://rosap.ntl.bts.gov/view/dot/92910
Wares, R. N. (1987). The Effect of Weathering on Octane Quality for Winter-Grade and Summer-Grade Gasolines (Report No. DOT/FAA/CT-87/16). United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. https://rosap.ntl.bts.gov/view/dot/92910

Wares, Richard N.. The Effect of Weathering on Octane Quality for Winter-Grade and Summer-Grade Gasolines. Report no. DOT/FAA/CT-87/16. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1987. https://rosap.ntl.bts.gov/view/dot/92910.

Wares, Richard N. The Effect of Weathering on Octane Quality for Winter-Grade and Summer-Grade Gasolines. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1987, Report no. DOT/FAA/CT-87/16, ROSA P. https://rosap.ntl.bts.gov/view/dot/92910.
Export RIS Citation Information. TY - Tech Report AU - Wares, Richard N. A2 - National Institute for Petroleum and Energy Research (NIPER}) A3 - United States. Department of Transportation. Federal Aviation Administration. Technical Center AB - Weathering tests were conducted to examine the effects on fuel volatility and octane characteristics. The commercially available gasolines utilized in the study represented a wide geographic distribution for both winter and summer fuels. Aging was accomplished by heating the fuel samples to 110 degrees F and maintaining that temperature for 48 hours. Time histories of Reid Vapor Pressure (RVP) were conducted. Fuel octane evaluations, both HON and RON, were done. Component characterization by gas chromatography were made to identify components lost during the aging process. AN - dot:92910 DA - 1987-12-01 ET - Final Report KW - Airplanes KW - Fires KW - Fuels KW - Gas chromatography KW - Gasoline KW - Testing LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1987 SN - DOT/FAA/CT-87/16 TI - The Effect of Weathering on Octane Quality for Winter-Grade and Summer-Grade Gasolines M3 - Tech Report N1 - United States N1 - DE-FC22-83FE60149 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92910 ER -
Determination of Test Methods to Quantify the Effects of Organic and Inorganic Constituents in Silica Sand Used for Construction

Ferraro, Christopher C. ;

Riding, Kyle A.

2026-07-01 | PDF

Florida-produced fine aggregates are generally of suitable quality, and deleterious effects associated with organic matter are uncommon. However, naturally occurring organic constituents can affect cement hydration and early-age strength development depending on their concentration, composition, and interaction with cementitious phases. The sands e ...

08/10/2026

Title : Determination of Test Methods to Quantify the Effects of Organic and Inorganic Constituents in Silica Sand Used for Construction Creator(s) : Ferraro, Christopher C.;Riding, Kyle A.;Patel, Ashish D.;Gordillo, José Ignacio Dávila;Mueller, Timothy K.; Corporate Creator(s) : University of Florida, Gainesville. Engineering School of Sustainable Infrastructure and Environment (ESSIE) Corporate Contributor(s) : Florida. Department of Transportation Contributor(s) : Shoucair, John Published Date : 2026-07-01 Report Number : BED31-977-30 URL : https://rosap.ntl.bts.gov/view/dot/92909
Ferraro, C. C., Riding, K. A., Patel, A. D., Gordillo, J. I. D., & Mueller, T. K. (2026). Determination of Test Methods to Quantify the Effects of Organic and Inorganic Constituents in Silica Sand Used for Construction (Report No. BED31-977-30). Florida. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/92909

Ferraro, Christopher C., Kyle A. Riding, Ashish D. Patel, José Ignacio Dávila Gordillo, and Timothy K. Mueller. Determination of Test Methods to Quantify the Effects of Organic and Inorganic Constituents in Silica Sand Used for Construction. Report no. BED31-977-30. Florida. Department of Transportation, 2026. https://rosap.ntl.bts.gov/view/dot/92909.

Ferraro, Christopher C., et al. Determination of Test Methods to Quantify the Effects of Organic and Inorganic Constituents in Silica Sand Used for Construction. Florida. Department of Transportation, 2026, Report no. BED31-977-30, ROSA P. https://rosap.ntl.bts.gov/view/dot/92909.
Export RIS Citation Information. TY - Tech Report AU - Ferraro, Christopher C. AU - Riding, Kyle A. AU - Patel, Ashish D. AU - Gordillo, José Ignacio Dávila AU - Mueller, Timothy K. A2 - University of Florida, Gainesville. Engineering School of Sustainable Infrastructure and Environment (ESSIE) A3 - Florida. Department of Transportation AB - Florida-produced fine aggregates are generally of suitable quality, and deleterious effects associated with organic matter are uncommon. However, naturally occurring organic constituents can affect cement hydration and early-age strength development depending on their concentration, composition, and interaction with cementitious phases. The sands evaluated in this study contained relatively low organic contents, making establishment of a universal organic-content threshold impractical. FDOT currently uses AASHTO T 21 as the primary screening method for potentially deleterious organic impurities and requires AASHTO T 71 testing when screening results indicate concern. This framework should be maintained. AASHTO T 21 provides effective statewide screening, while AASHTO T 71 provides performance-based confirmation. However, AASHTO T 21 is qualitative, and AASHTO T 71 requires extended testing that can delay aggregate acceptance decisions. Neither elemental analysis nor the Modified Walkley-Black method demonstrated sufficient precision, consistency, or correlation with AASHTO T 21 to support statewide acceptance criteria. However, MWB may be used to establish mine-specific organic-carbon baselines, and isothermal calorimetry may be used to establish mine-specific hydration-response baselines. Deviations from these baselines may indicate the need for additional evaluation, including AASHTO T 71 testing. Organic-carbon contents below approximately 0.015% did not measurably affect hydration or compressive strength. Alkaline washing reduced measured organic content and increased pH but did not consistently improve strength. The ASTM C109 hand-tamped consolidation procedure is recommended for AASHTO T 71 mortar cube fabrication. Trace inorganic constituents, including phosphorus, did not produce measurable strength effects. AN - dot:92909 DA - 2026-07-01 ET - Final Report: June, 2024 - July, 2026 KW - Silica sands KW - Fine aggregates KW - Impurities KW - Organic materials KW - Testing KW - Sand KW - Construction KW - Performance measurement KW - Hydration KW - Data analysis KW - Cement KW - Organic Impurities KW - AASHTO T 21 KW - AASHTO T 71 KW - Modified Walkley-Black KW - Isothermal Conduction Calorimetry LA - English PB - Florida. Department of Transportation PY - 2026 SN - BED31-977-30 TI - Determination of Test Methods to Quantify the Effects of Organic and Inorganic Constituents in Silica Sand Used for Construction M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92909 ER -
Review of State Comprehensive Computerized Highway Information System

Duffy, T. ;

Wyznyckyj, L.

1987-05-01 | PDF

This report presents an overview of where the computerized highway information system is now, and its status as a planning and programming tool for state highway agencies. A computerized highway information system is simply a computer linked system which can be used by many divisions of a transportation agency to obtain information to meet data rep ...

08/10/2026

Title : Review of State Comprehensive Computerized Highway Information System Creator(s) : Duffy, T.;Wyznyckyj, L.; Corporate Creator(s) : Urbitran Associates Corporate Contributor(s) : United States. Federal Highway Administration. Office of Implementation Contributor(s) : Hatzi, Peter J. Published Date : 1987-05-01 Report Number : FHWA-TS-87-220 URL : https://rosap.ntl.bts.gov/view/dot/92908
Duffy, T., & Wyznyckyj, L. (1987). Review of State Comprehensive Computerized Highway Information System (Report No. FHWA-TS-87-220). United States. Federal Highway Administration. Office of Implementation. https://rosap.ntl.bts.gov/view/dot/92908

Duffy, T. and L. Wyznyckyj. Review of State Comprehensive Computerized Highway Information System. Report no. FHWA-TS-87-220. United States. Federal Highway Administration. Office of Implementation, 1987. https://rosap.ntl.bts.gov/view/dot/92908.

Duffy, T., and L. Wyznyckyj Review of State Comprehensive Computerized Highway Information System. United States. Federal Highway Administration. Office of Implementation, 1987, Report no. FHWA-TS-87-220, ROSA P. https://rosap.ntl.bts.gov/view/dot/92908.
Export RIS Citation Information. TY - Tech Report AU - Duffy, T. AU - Wyznyckyj, L. A2 - Urbitran Associates A3 - United States. Federal Highway Administration. Office of Implementation A4 - Hatzi, P.J. AB - This report presents an overview of where the computerized highway information system is now, and its status as a planning and programming tool for state highway agencies. A computerized highway information system is simply a computer linked system which can be used by many divisions of a transportation agency to obtain information to meet data reporting, analyses or other informational needs. The description of the highway information system includes: current use and status, applications, organization and system development, benefits and problems. AN - dot:92908 DA - 1987-05-01 ET - Final Report KW - Computer programming KW - Information systems KW - Planning KW - State departments of transportation KW - Datasets LA - English PB - United States. Federal Highway Administration. Office of Implementation PY - 1987 SN - FHWA-TS-87-220 TI - Review of State Comprehensive Computerized Highway Information System M3 - Tech Report N1 - United States N1 - DTFH61-P4-C-OOO14 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92908 ER -
Evaluation of the PAVEDEX Road Survey System in Iowa

Cable, James K. ;

Dankbar, Roman

1990-04-01 | PDF

The Iowa Department of Transportation (IDOT) evaluated the PAS I Road Survey System from PAVEDEX, Inc., of Spokane, Washington. This system uses video photography to identify and quantify pavement cracking and patching distresses. Comparisons were made to procedures currently used in the State. Interstate highway, county roads and city streets, and ...

08/10/2026

Title : Evaluation of the PAVEDEX Road Survey System in Iowa Creator(s) : Cable, James K.;Dankbar, Roman; Corporate Creator(s) : Iowa. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration;United States. Department of Transportation. Federal Highway Administration. Turner-Fairbank Highway Research Center; Contributor(s) : Brown, Douglas Published Date : 1990-04-01 Report Number : FHWA-TS-90-038 URL : https://rosap.ntl.bts.gov/view/dot/92907
Cable, J. K., & Dankbar, R. (1990). Evaluation of the PAVEDEX Road Survey System in Iowa (Report No. FHWA-TS-90-038). United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/92907

Cable, James K. and Roman Dankbar. Evaluation of the PAVEDEX Road Survey System in Iowa. Report no. FHWA-TS-90-038. United States. Department of Transportation. Federal Highway Administration, 1990. https://rosap.ntl.bts.gov/view/dot/92907.

Cable, James K., and Roman Dankbar Evaluation of the PAVEDEX Road Survey System in Iowa. United States. Department of Transportation. Federal Highway Administration, 1990, Report no. FHWA-TS-90-038, ROSA P. https://rosap.ntl.bts.gov/view/dot/92907.
Export RIS Citation Information. TY - Tech Report AU - Cable, James K. AU - Dankbar, Roman A2 - Iowa. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration A3 - United States. Department of Transportation. Federal Highway Administration. Turner-Fairbank Highway Research Center A4 - Brown, Doug AB - The Iowa Department of Transportation (IDOT) evaluated the PAS I Road Survey System from PAVEDEX, Inc., of Spokane, Washington. This system uses video photography to identify and quantify pavement cracking and patching distresses. Comparisons were made to procedures currently used in the State. Interstate highway, county roads and city streets, and two shoulder sections were evaluated. Variables included travel speeds, surface type and texture, and traffic control conditions. Repeatability and distress identification were excellent on rigid pavements. Differences in distress identification and the effect of surface textures in the flexible test sections limited the repeatability and correlation of data to that of the IDOT method. Cost data indicates that PAVEDEX is capable of providing comparable results with improved accuracy at a reasonable cost, but in excess of that experienced currently by the IDOT. PAVEDEX is capable of providing network level pavement condition data at highway speeds and analysis of the data to identify 1/8-inch cracks at approximately 2-3 lane miles per hour with manual evaluation. Photologging capability is also included in the unit. AN - dot:92907 DA - 1990-04-01 ET - Final Report KW - Condition surveys KW - Pavement distress KW - Evaluation KW - Pavement design KW - Pavement cracking KW - Testing equipment LA - English PB - United States. Department of Transportation. Federal Highway Administration PY - 1990 SN - FHWA-TS-90-038 TI - Evaluation of the PAVEDEX Road Survey System in Iowa M3 - Tech Report N1 - United States N1 - DTFH61-88-C-00138 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92907 ER -
Emissions Benefits of Land Use Planning Strategies

Louis Berger, Inc.

2004-12-20 | PDF

The U.S. Department of Transportation (USDOT) Federal Highway Administration sponsored a study of the methods currently employed to quantify mobile source emissions benefits from land use changes. The study contains reviews of 46 relevant literature items; 10 case studies from around the country describing applied methods; state-of-the-practice and ...

08/10/2026

Title : Emissions Benefits of Land Use Planning Strategies Corporate Creator(s) : Louis Berger, Inc. Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 2004-12-20 Report Number : FHWA-TOPR-29 URL : https://rosap.ntl.bts.gov/view/dot/92906
Louis Berger, Inc. (2004). Emissions Benefits of Land Use Planning Strategies (Report No. FHWA-TOPR-29). United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/92906

Louis Berger, Inc.. Emissions Benefits of Land Use Planning Strategies. Report no. FHWA-TOPR-29. United States. Department of Transportation. Federal Highway Administration, 2004. https://rosap.ntl.bts.gov/view/dot/92906.

Louis Berger, Inc. Emissions Benefits of Land Use Planning Strategies. United States. Department of Transportation. Federal Highway Administration, 2004, Report no. FHWA-TOPR-29, ROSA P. https://rosap.ntl.bts.gov/view/dot/92906.
Export RIS Citation Information. TY - Tech Report A2 - Louis Berger, Inc. A3 - United States. Department of Transportation. Federal Highway Administration AB - The U.S. Department of Transportation (USDOT) Federal Highway Administration sponsored a study of the methods currently employed to quantify mobile source emissions benefits from land use changes. The study contains reviews of 46 relevant literature items; 10 case studies from around the country describing applied methods; state-of-the-practice and advanced practice methods; and recommendations for future technical and procedural improvements. The Research Team found that a variety of studies and applications have been performed by a relatively few number of researchers and Metropolitan Planning Organizations (MPOs). Rather than pursuing this work as part of a conformity determination, many of these exercises have been accomplished as part of a community "visioning" process undertaken by local governments. The research that has been done has identified relationships between vehicle miles of travel, trip frequency, trip length, and mode choice. Also, a number of problems with the research have been noted, including consistency in data development, availability of data, subjectivity in measurement, shortcomings in existing modeling techniques, difficulty in assigning causation, and cross-correlation between independent variables. The paper concludes with recommendations and ideas for future research to improve land use, travel demand and emissions models; and support pathways of the dissemination of information among end-user communities. Appendices and the accompanying CD-ROM contain data resources, case studies, and a summary of elasticity applications. AN - dot:92906 DA - 2004-12-20 KW - Exhaust gases KW - Air quality KW - Land use KW - Travel demand KW - Travel behavior KW - Land use planning LA - English PB - United States. Department of Transportation. Federal Highway Administration PY - 2004 SN - FHWA-TOPR-29 TI - Emissions Benefits of Land Use Planning Strategies M3 - Tech Report N1 - United States N1 - DTFH61-98-D-00105 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92906 ER -
Geotextile Selection and Installation Manual for Rural Unpaved Roads

Hopkins, J.

1989-04-01 | PDF

This report is to serve as a guide for local officials in selecting and installing geotextiles on rural unpaved roads. Various techniques are presented to address most of the common conditions and situations present on rural roads.

08/10/2026

Title : Geotextile Selection and Installation Manual for Rural Unpaved Roads Creator(s) : Hopkins, J. Corporate Creator(s) : Oklahoma State University. Center for Local Government Technology Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration;National Highway Institute (U.S.); Contributor(s) : DiMaggio, Jerry A.;Hershey, H Garland; Published Date : 1989-04-01 Report Number : FHWA-RT-89-050 URL : https://rosap.ntl.bts.gov/view/dot/92905
Hopkins, J. (1989). Geotextile Selection and Installation Manual for Rural Unpaved Roads (Report No. FHWA-RT-89-050). United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/92905

Hopkins, J.. Geotextile Selection and Installation Manual for Rural Unpaved Roads. Report no. FHWA-RT-89-050. United States. Department of Transportation. Federal Highway Administration, 1989. https://rosap.ntl.bts.gov/view/dot/92905.

Hopkins, J. Geotextile Selection and Installation Manual for Rural Unpaved Roads. United States. Department of Transportation. Federal Highway Administration, 1989, Report no. FHWA-RT-89-050, ROSA P. https://rosap.ntl.bts.gov/view/dot/92905.
Export RIS Citation Information. TY - Tech Report AU - Hopkins, J. A2 - Oklahoma State University. Center for Local Government Technology A3 - United States. Department of Transportation. Federal Highway Administration A3 - National Highway Institute (U.S.) A4 - Dimaggio, J.; Hershey, H. AB - This report is to serve as a guide for local officials in selecting and installing geotextiles on rural unpaved roads. Various techniques are presented to address most of the common conditions and situations present on rural roads. AN - dot:92905 DA - 1989-04-01 ET - Technology Sharing Report KW - Geotextiles KW - Construction KW - Rural highways KW - Unpaved roads KW - Installation KW - Manuals LA - English PB - United States. Department of Transportation. Federal Highway Administration PY - 1989 SN - FHWA-RT-89-050 TI - Geotextile Selection and Installation Manual for Rural Unpaved Roads M3 - Tech Report N1 - United States N1 - RTAP #56 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92905 ER -
Guardrail Height Safety Requirements Given Recent Crash History and Evolution of Vehicle Design: Final Report

Parr, Scott A.

;

Morgan, Delaney

2026-08-01 | PDF

Over the past several decades, the U.S. vehicle fleet has shifted toward larger, taller, and heavier vehicles, raising questions about whether roadside safety systems remain aligned with real-world vehicle characteristics. This study evaluated the adequacy of the Florida Department of Transportation's current 31-inch guardrail height standard relat ...

08/10/2026

Title : Guardrail Height Safety Requirements Given Recent Crash History and Evolution of Vehicle Design: Final Report Creator(s) : Parr, Scott A.;Morgan, Delaney; Corporate Creator(s) : Embry-Riddle Aeronautical University Corporate Contributor(s) : Florida. Department of Transportation Published Date : 2026-08-01 URL : https://rosap.ntl.bts.gov/view/dot/92904
Parr, S. A., & Morgan, D. (2026). Guardrail Height Safety Requirements Given Recent Crash History and Evolution of Vehicle Design: Final Report. Florida. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/92904

Parr, Scott A. and Delaney Morgan. Guardrail Height Safety Requirements Given Recent Crash History and Evolution of Vehicle Design: Final Report. Florida. Department of Transportation, 2026. https://rosap.ntl.bts.gov/view/dot/92904.

Parr, Scott A., and Delaney Morgan Guardrail Height Safety Requirements Given Recent Crash History and Evolution of Vehicle Design: Final Report. Florida. Department of Transportation, 2026, ROSA P. https://rosap.ntl.bts.gov/view/dot/92904.
Export RIS Citation Information. TY - Tech Report AU - Parr, Scott A. AU - Morgan, Delaney A2 - Embry-Riddle Aeronautical University A3 - Florida. Department of Transportation AB - Over the past several decades, the U.S. vehicle fleet has shifted toward larger, taller, and heavier vehicles, raising questions about whether roadside safety systems remain aligned with real-world vehicle characteristics. This study evaluated the adequacy of the Florida Department of Transportation's current 31-inch guardrail height standard relative to the previous 27¾-inch standard and recent guardrail failure outcomes in Florida. The research included a review of guardrail height practices, analysis of vehicle center of gravity, weight, and fleet composition trends, identification and classification of confirmed guardrail failure crashes, statistical comparison of failure patterns by guardrail height and vehicle characteristics, and an Annual Average Daily Traffic-normalized hot-spot analysis. Confirmed failures with known guardrail height were distributed in proportions consistent with statewide inventory prevalence, indicating no evidence that either height standard was overrepresented in the failure dataset overall. Vehicle center of gravity was significantly higher in Over failures than in Through failures, while vehicle weight was not a significant predictor of failure mode. Over failures were directionally less common at 31-inch installations than expected based on inventory proportions, but the difference was not statistically significant. The hot-spot analysis identified locations where repeated failures may warrant additional field or engineering review. Overall, the findings support continued use of the 31-inch standard while emphasizing continued monitoring of vehicle fleet trends, guardrail performance, site-specific failure conditions, and potential future design adaptations as the vehicle fleet continues to evolve. AN - dot:92904 DA - 2026-08-01 ET - Final Report KW - Guardrails KW - Standards KW - Roadside KW - Highway safety KW - Impact KW - Vehicle performance KW - Literature reviews KW - Crash data KW - Datasets KW - Fleet management KW - Statistical analysis KW - Guardrail Height Standards KW - Roadside Safety KW - Vehicle Impact Performance LA - English PB - Florida. Department of Transportation PY - 2026 TI - Guardrail Height Safety Requirements Given Recent Crash History and Evolution of Vehicle Design: Final Report M3 - Tech Report N1 - United States N1 - BED32-977-03 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92904 ER -
Sensitivity Analysis of MOBILE6: Motor Vehicle Emission Factor Model

Tang, Tianjia ;

Roberts, Mike

2003-01-01 | PDF

On January 29, 2002, the US Environmental Protection Agency (EPA) officially released the latest motor vehicle emission factor model - MOBILE6. This release represents significant achievements in understanding both the motor vehicle performance and driver behavior when estimating motor vehicle emissions. The model also establishes routines to compu ...

08/10/2026

Title : Sensitivity Analysis of MOBILE6: Motor Vehicle Emission Factor Model Creator(s) : Tang, Tianjia;Roberts, Mike;Ho, Cecilia; Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration. Resource Center Published Date : 2003-01-01 Report Number : FHWA-RC-Atlanta-03-0007 URL : https://rosap.ntl.bts.gov/view/dot/92903
Tang, T., Roberts, M., & Ho, C. (2003). Sensitivity Analysis of MOBILE6: Motor Vehicle Emission Factor Model (Report No. FHWA-RC-Atlanta-03-0007). United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/92903

Tang, Tianjia, Mike Roberts, and Cecilia Ho. Sensitivity Analysis of MOBILE6: Motor Vehicle Emission Factor Model. Report no. FHWA-RC-Atlanta-03-0007. United States. Department of Transportation. Federal Highway Administration, 2003. https://rosap.ntl.bts.gov/view/dot/92903.

Tang, Tianjia, et al. Sensitivity Analysis of MOBILE6: Motor Vehicle Emission Factor Model. United States. Department of Transportation. Federal Highway Administration, 2003, Report no. FHWA-RC-Atlanta-03-0007, ROSA P. https://rosap.ntl.bts.gov/view/dot/92903.
Export RIS Citation Information. TY - Brief AU - Tang, Tianjia AU - Roberts, Mike AU - Ho, Cecilia A2 - United States. Department of Transportation. Federal Highway Administration A3 - United States. Department of Transportation. Federal Highway Administration. Resource Center AB - On January 29, 2002, the US Environmental Protection Agency (EPA) officially released the latest motor vehicle emission factor model - MOBILE6. This release represents significant achievements in understanding both the motor vehicle performance and driver behavior when estimating motor vehicle emissions. The model also establishes routines to compute and analyze fuel and vehicle certification standards, state programs and different highway facilities as related to vehicle emission factors. Significant efforts by the US EPA were also carried out to establish a national default database used by the computer model. Along with the MOBILE6 release, more than 48 technical papers related to MOBILE6 development were also released. Overall, the MOBILE6 model predicts higher emission rates in the near future years and lower emission rates in the out years when compared to the MOBILE5 series models. MOBILE6 is the approved US EPA motor vehicle emission factor model for estimating volatile organic compounds (VOC), nitrogen oxides (NOx), and carbon monoxide (CO) from different vehicles. State and local air quality and transportation agencies outside of California are required to use MOBILE6 in State Implementation Plan (SIP) development, and transportation conformity determination. The official release of MOBILE6 on January 29, 2002 started the 2-year grace period before MOBILE6 is required for new conformity determinations in most areas. As the end of the grace period approaches, transportation as well as air quality agencies are gaining an understanding of the behavior of the model, especially in impacts of using localized data as compared to EPA's national default data. Understanding the behavior of the model under various conditions becomes more critical as the tasks of collecting local data is time and resources intensive. The purpose of this paper is to provide a basic evaluation of the MOBILE6 model behavior under various conditions. Through the understanding of the model's behavior, state and local agencies can prioritize costly data collecting efforts and ultimately initiate emission control strategies according to parameter sensitivity. AN - dot:92903 DA - 2003-01-01 KW - Exhaust gases KW - Air pollution KW - Air quality KW - Environmental protection KW - Sensitivity analysis LA - English PB - United States. Department of Transportation. Federal Highway Administration PY - 2003 SN - FHWA-RC-Atlanta-03-0007 TI - Sensitivity Analysis of MOBILE6: Motor Vehicle Emission Factor Model M3 - Brief N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92903 ER -
Navigation Recovery Block Design Description

Hitt, E. F. ;

Prater, S. A.

1987-03-01 | PDF

This report describes the recovery block approach to fault-tolerant software and illustrates its application to a flight navigation problem. The navigation problem using VOR (Visual Omnirange) and DME (Distance Measuring Equipment) is developed, especially with regard to its software specification and implementation needs. Related aspects of the re ...

08/10/2026

Title : Navigation Recovery Block Design Description Creator(s) : Hitt, E. F.;Prater, S. A.; Corporate Creator(s) : Lockheed-California Company Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Technical Center Published Date : 1987-03-01 Report Number : DOT/FAA/CT-87/15 URL : https://rosap.ntl.bts.gov/view/dot/92902
Hitt, E. F., & Prater, S. A. (1987). Navigation Recovery Block Design Description (Report No. DOT/FAA/CT-87/15). United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. https://rosap.ntl.bts.gov/view/dot/92902

Hitt, E. F. and S. A. Prater. Navigation Recovery Block Design Description. Report no. DOT/FAA/CT-87/15. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1987. https://rosap.ntl.bts.gov/view/dot/92902.

Hitt, E. F., and S. A. Prater Navigation Recovery Block Design Description. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1987, Report no. DOT/FAA/CT-87/15, ROSA P. https://rosap.ntl.bts.gov/view/dot/92902.
Export RIS Citation Information. TY - Tech Report AU - Hitt, E. F. AU - Prater, S. A. A2 - Lockheed-California Company A3 - United States. Department of Transportation. Federal Aviation Administration. Technical Center AB - This report describes the recovery block approach to fault-tolerant software and illustrates its application to a flight navigation problem. The navigation problem using VOR (Visual Omnirange) and DME (Distance Measuring Equipment) is developed, especially with regard to its software specification and implementation needs. Related aspects of the recovery block approach are reviewed, and Ada implemented source code is presented. AN - dot:92902 DA - 1987-03-01 ET - Final Report KW - Aeronautics KW - Airplanes KW - Electronic equipment KW - Electronics KW - Software KW - System architecture LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1987 SN - DOT/FAA/CT-87/15 TI - Navigation Recovery Block Design Description M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92902 ER -

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