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Showing 61 - 80 of 460 results

Understanding Causes of Concrete Culvert Pipe Joint Separation

Hedegaard, Brock D. ;

Carranza-Torres, Carlos

2026-02-01 | PDF

Joint separations affect approximately 20% of the Minnesota concrete pipe inventory (Taylor and Marr 2012). The goals of this research are to determine the factors that contribute to joint separation and recommend practices to mitigate this problem. Research efforts follow a three-pronged approach: (1) Examination of TAMS HydInfra database; (2) fie ...

07/06/2026

Title : Understanding Causes of Concrete Culvert Pipe Joint Separation Creator(s) : Hedegaard, Brock D.;Carranza-Torres, Carlos;Dymond, Benjamin Z;Faeli, Mehdi; Corporate Creator(s) : University of Minnesota, Duluth. Department of Civil Engineering Corporate Contributor(s) : Minnesota. Department of Transportation. Office of Research & Innovation Published Date : 2026-02-01 Report Number : MN 2026-13 URL : https://rosap.ntl.bts.gov/view/dot/92360 Hedegaard, Brock D. et al. (2026). Understanding Causes of Concrete Culvert Pipe Joint Separation. Hedegaard, Brock D. et al. "Understanding Causes of Concrete Culvert Pipe Joint Separation" (2026) Hedegaard, Brock D. et al. "Understanding Causes of Concrete Culvert Pipe Joint Separation" , 2026 Export RIS Citation Information. TY - Tech Report AU - Hedegaard, Brock D. AU - Carranza-Torres, Carlos AU - Dymond, Benjamin Z AU - Faeli, Mehdi A2 - University of Minnesota, Duluth. Department of Civil Engineering A3 - Minnesota. Department of Transportation. Office of Research & Innovation AB - Joint separations affect approximately 20% of the Minnesota concrete pipe inventory (Taylor and Marr 2012). The goals of this research are to determine the factors that contribute to joint separation and recommend practices to mitigate this problem. Research efforts follow a three-pronged approach: (1) Examination of TAMS HydInfra database; (2) field survey of concrete culverts; and (3) computational modeling of soil-culvert systems. Database investigations were conducted using a Random Forest model along with individual feature analysis to determine factors that correlate with joint separations. Geographic features such as the county and route number of the culvert are more important for predicting joint separation than geometric features such as culvert size or cover depth. Field surveys reveal that separations typically occurred at the ends of pipes, or in the first untied joint from the end of the pipe if only some joints were tied. Joint separation was often observed alongside other distress such as infiltration or inslope voids. Computational modeling results show that embankment self-weight and traffic loading concentrate their highest demands under the center of the road, which did not match with field inspections. Soil freezing or changes of water-table level impose greater demands than traffic, and these maximum demands are located at the pipe ends, and thus these mechanisms are more likely to result in joint separation. Recommendations include tying all joints on installation, properly compacting the backfill, and limiting freezing expansion of the embankment materials, particularly if a cohesive soil cap is used. AN - dot:92360 ET - Final Report KW - Concrete culverts KW - Joints KW - Culvert pipe KW - Mathematical models KW - Mechanical analysis KW - Surveys LA - English PB - Minnesota. Department of Transportation. Office of Research & Innovation PY - 2026-02-01 SN - MN 2026-13 TI - Understanding Causes of Concrete Culvert Pipe Joint Separation M3 - Tech Report N1 - United States N1 - (c)1036342 (wo) 94 UR - https://rosap.ntl.bts.gov/view/dot/92360 ER -
Haul Road and Detour Maintenance

Marasteanu, Mihai ;

Levin, Michael W.

2026-01-01 | PDF

Highway construction projects frequently require detours and haul roads that divert traffic, including heavy trucks, onto local roads not originally designed for such loads. These temporary routes can accelerate pavement deterioration, reduce service life, and impose significant maintenance costs on local agencies. Current compensation practices, s ...

07/06/2026

Title : Haul Road and Detour Maintenance Creator(s) : Marasteanu, Mihai;Levin, Michael W.;Zhao, Zifeng;Nouhi, Shaghayegh;Turos, Mugurel; Corporate Creator(s) : University of Minnesota. Dept. of Civil, Environmental, and Geo-Engineering Corporate Contributor(s) : Minnesota. Department of Transportation. Office of Research & Innovation Published Date : 2026-01-01 URL : https://rosap.ntl.bts.gov/view/dot/92359 Marasteanu, Mihai et al. (2026). Haul Road and Detour Maintenance. Marasteanu, Mihai et al. "Haul Road and Detour Maintenance" (2026) Marasteanu, Mihai et al. "Haul Road and Detour Maintenance" , 2026 Export RIS Citation Information. TY - Tech Report AU - Marasteanu, Mihai AU - Levin, Michael W. AU - Zhao, Zifeng AU - Nouhi, Shaghayegh AU - Turos, Mugurel A2 - University of Minnesota. Dept. of Civil, Environmental, and Geo-Engineering A3 - Minnesota. Department of Transportation. Office of Research & Innovation AB - Highway construction projects frequently require detours and haul roads that divert traffic, including heavy trucks, onto local roads not originally designed for such loads. These temporary routes can accelerate pavement deterioration, reduce service life, and impose significant maintenance costs on local agencies. Current compensation practices, such as Minnesota’s Gas Tax Method and Equivalent Overlay Method, offer partial solutions but do not fully capture the variability of damage across different pavements and traffic conditions. This study investigates the structural and economic impacts of detours and haul roads on Minnesota’s roadway network and develops a framework for improved evaluation and planning. A comprehensive literature review of empirical and engineering-based approaches to estimating pavement damage is first conducted, along with a survey of compensation practices across U.S. states. Field data are next collected from five detour routes and two haul roads using Falling Weight Deflectometer (FWD), and Ground Penetrating Radar (GPR). The results are then used to estimate Remaining Service Life (RSL). Due to significant variability in FWD testing, MnDOT’s calibrated pavement performance curves are applied to estimate damage, with a case study demonstrating that a three-month detour could reduce service life by more than two years. Additionally, a multiclass traffic assignment model is implemented to predict vehicle-type-specific flows under closures, and optimization techniques using genetic algorithms are developed to identify detour routes that minimize truck-related pavement damage while maintaining network efficiency. While the findings provide some practical tools and recommendations for more equitable compensation and improved detour planning, more research is needed to validate the results obtained in this study. AN - dot:92359 KW - Detours KW - Pavement performance KW - Deterioration KW - Service life KW - Traffic assignment KW - Optimization KW - Case studies KW - Haul roads LA - English PB - Minnesota. Department of Transportation. Office of Research & Innovation PY - 2026-01-01 TI - Haul Road and Detour Maintenance M3 - Tech Report N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/92359 ER -
DOT Guide to CAB Sunset

United States. Department of Transportation

1985-01-01 | PDF

Guide to Department of Transportation Administration of Airline Economic Regulatory Functions Transferred from the Civil Aeronautics Board.

07/06/2026

Title : DOT Guide to CAB Sunset Corporate Creator(s) : United States. Department of Transportation Published Date : 1985-01-01 URL : https://rosap.ntl.bts.gov/view/dot/92358 United States. Department of Transportation (1985). DOT Guide to CAB Sunset. United States. Department of Transportation "DOT Guide to CAB Sunset" (1985) United States. Department of Transportation "DOT Guide to CAB Sunset" , 1985 Export RIS Citation Information. TY - Manual A2 - United States. Department of Transportation AB - Guide to Department of Transportation Administration of Airline Economic Regulatory Functions Transferred from the Civil Aeronautics Board. AN - dot:92358 KW - Guides to information KW - Airlines KW - Regulations KW - Aeronautics KW - Policy KW - Decision making LA - English PB - United States. Department of Transportation PY - 1985-01-01 TI - DOT Guide to CAB Sunset M3 - Manual N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/92358 ER -
User-Centered Smart Traffic Sign Development Implementation Study

Tameh, Ehsan Kazemi ;

Kyong, Hongjoon

2026-03-01 | PDF

Flaggers maintain traffic flow through a work zone area despite a shutdown of lanes by providing temporary traffic control. In terms of occupational safety, flaggers have one of the highest risk jobs in the country, with 41 out of every 100,000 workers killed on the job each year. This project developed and tested technology for automatically detec ...

07/06/2026

Title : User-Centered Smart Traffic Sign Development Implementation Study Creator(s) : Tameh, Ehsan Kazemi;Kyong, Hongjoon;Jorgensen, Helenrose;Drahos, Bradley A.;Morris, Nichole;Rajamani, Rajesh; Corporate Creator(s) : University of Minnesota, Minneapolis Corporate Contributor(s) : Minnesota. Department of Transportation. Office of Research & Innovation Published Date : 2026-03-01 Report Number : 2026-10 URL : https://rosap.ntl.bts.gov/view/dot/92357 Tameh, Ehsan Kazemi et al. (2026). User-Centered Smart Traffic Sign Development Implementation Study. Tameh, Ehsan Kazemi et al. "User-Centered Smart Traffic Sign Development Implementation Study" (2026) Tameh, Ehsan Kazemi et al. "User-Centered Smart Traffic Sign Development Implementation Study" , 2026 Export RIS Citation Information. TY - Tech Report AU - Tameh, Ehsan Kazemi AU - Kyong, Hongjoon AU - Jorgensen, Helenrose AU - Drahos, Bradley A. AU - Morris, Nichole AU - Rajamani, Rajesh A2 - University of Minnesota, Minneapolis A3 - Minnesota. Department of Transportation. Office of Research & Innovation AB - Flaggers maintain traffic flow through a work zone area despite a shutdown of lanes by providing temporary traffic control. In terms of occupational safety, flaggers have one of the highest risk jobs in the country, with 41 out of every 100,000 workers killed on the job each year. This project developed and tested technology for automatically detecting and documenting the occurrence of near-intrusions into a flagger-controlled work zone. The project developed a low-cost portable device for automatically tracking vehicle trajectories, detecting potential intrusions, and providing audio-visual alerts to warn any errant drivers who might cause a danger to flaggers and workers in the construction zone. A radar sensor on the device is deployed by using a telescoping pole and collects simultaneous measurements from approaching vehicles in multiple lanes. Tests were conducted in six real-world traffic scenarios, including work zones at one rural location (Cook County), three urban locations (Saint Paul, White Bear Lake, and Eden Prairie), a synthetic urban zone involving pedestrian crossings (Saint Paul) and one suburban/rural location (Mound). Detailed results and analysis are presented in this report. The results indicate that multiple design iterations have improved the device and enabled it to work reliably – Very few false alarms (if any) are triggered and the intrusion detection curves implemented in the system are verified to work well. The vehicles which were alerted using audio-visual warnings in the last work zone test responded appropriately with a majority of them slowing down in response to the alarms. AN - dot:92357 ET - Final Report KW - Work zone safety KW - Radar tracking KW - Vehicle detectors KW - User interfaces KW - Traffic signs KW - Vehicle trajectories LA - English PB - Minnesota. Department of Transportation. Office of Research & Innovation PY - 2026-03-01 SN - 2026-10 TI - User-Centered Smart Traffic Sign Development Implementation Study M3 - Tech Report N1 - United States N1 - (c)1036342 (wo) 113 UR - https://rosap.ntl.bts.gov/view/dot/92357 ER -
Final Regulatory Analysis for Model Years 1983–85 Light Truck Fuel Economy Standards

United States. Department of Transportation. National Highway Traffic Safety Administration

1980-11-01 | PDF

Final light truck fuel economy standards for model years (MY) 1983-85 are established as shown below. In addition to continuing separate standards for two-wheel drive (4x2's) and four-wheel drive (4x4's) trucks, the Agency, in desiring to maximize manufacturer marketing and investment flexibility, has also established a single composite standard. C ...

07/06/2026

Title : Final Regulatory Analysis for Model Years 1983–85 Light Truck Fuel Economy Standards Corporate Creator(s) : United States. Department of Transportation. National Highway Traffic Safety Administration Published Date : 1980-11-01 URL : https://rosap.ntl.bts.gov/view/dot/92356 United States. Department of Transportation. National Highway Traffic Safety Administration (1980). Final Regulatory Analysis for Model Years 1983–85 Light Truck Fuel Economy Standards. United States. Department of Transportation. National Highway Traffic Safety Administration "Final Regulatory Analysis for Model Years 1983–85 Light Truck Fuel Economy Standards" (1980) United States. Department of Transportation. National Highway Traffic Safety Administration "Final Regulatory Analysis for Model Years 1983–85 Light Truck Fuel Economy Standards" , 1980 Export RIS Citation Information. TY - Tech Report A2 - United States. Department of Transportation. National Highway Traffic Safety Administration AB - Final light truck fuel economy standards for model years (MY) 1983-85 are established as shown below. In addition to continuing separate standards for two-wheel drive (4x2's) and four-wheel drive (4x4's) trucks, the Agency, in desiring to maximize manufacturer marketing and investment flexibility, has also established a single composite standard. Compliance may be achieved with either the 4x2 and 4x4 standards, or the single composite standard, at a manufacturer's option. AN - dot:92356 KW - Regulations KW - Light trucks KW - Fuel consumption KW - Economic factors LA - English PB - United States. Department of Transportation. National Highway Traffic Safety Administration PY - 1980-11-01 TI - Final Regulatory Analysis for Model Years 1983–85 Light Truck Fuel Economy Standards M3 - Tech Report N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/92356 ER -
Improving and Developing Pavement Design Inputs and Performance Functions for Cold Recycled Pavement Layers in Minnesota

Dave, Eshan V. ;

Sias, Jo E.

2026-01-01 | PDF

Existing specifications in Minnesota and many other states fail to adequately characterize the properties of cold recycled pavement materials necessary for pavement design procedures. Current assumptions for these materials are not entirely accurate as these materials often possess complex, non-linear, stress and rate dependent behavior. This can l ...

07/06/2026

Supporting Files

Title : Improving and Developing Pavement Design Inputs and Performance Functions for Cold Recycled Pavement Layers in Minnesota Creator(s) : Dave, Eshan V.;Sias, Jo E.;Al-Ihekwaba, Ebubechukwu; Corporate Creator(s) : University of New Hampshire. Department of Civil and Environmental Engineering;Local Road Research Board; Corporate Contributor(s) : Minnesota. Department of Transportation. Research Services & Library Published Date : 2026-01-01 Report Number : MN 2026-12 URL : https://rosap.ntl.bts.gov/view/dot/92355 Dave, Eshan V. et al. (2026). Improving and Developing Pavement Design Inputs and Performance Functions for Cold Recycled Pavement Layers in Minnesota. Dave, Eshan V. and Sias, Jo E. and Al-Ihekwaba, Ebubechukwu "Improving and Developing Pavement Design Inputs and Performance Functions for Cold Recycled Pavement Layers in Minnesota" (2026) Dave, Eshan V. et al. "Improving and Developing Pavement Design Inputs and Performance Functions for Cold Recycled Pavement Layers in Minnesota" , 2026 Export RIS Citation Information. TY - Tech Report AU - Dave, Eshan V. AU - Sias, Jo E. AU - Al-Ihekwaba, Ebubechukwu A2 - University of New Hampshire. Department of Civil and Environmental Engineering A2 - Local Road Research Board A3 - Minnesota. Department of Transportation. Research Services & Library AB - Existing specifications in Minnesota and many other states fail to adequately characterize the properties of cold recycled pavement materials necessary for pavement design procedures. Current assumptions for these materials are not entirely accurate as these materials often possess complex, non-linear, stress and rate dependent behavior. This can lead to under/overdesigned pavement structures that are not economically and environmentally viable. Adequately characterizing the recycled material layer will ensure that the appropriate thickness of wear course is determined through pavement design with no negative impact on structural capacity or serviceability. This research, through a series of laboratory and field investigations, develops a user-friendly, Excel-based material property prediction tool to estimate necessary material properties to be used in quality assurance evaluation and/or performance modelling efforts within mechanistic-empirical design of cold recycled pavement structures. In addition, a rutting performance function and early life rutting failure threshold is developed to assist in minimizing the risk of premature rutting failure of the recycled layer. From these, longer pavement lives can be achieved, leading to a decrease in the frequency of repair and maintenance as well as the costs associated with them. AN - dot:92355 ET - Final Report KW - Cold in-place recycling KW - Full-depth reclamation KW - Emulsions KW - Predictive models KW - Performance based specifications KW - Mechanical properties KW - Mechanistic-empirical pavement design KW - Pavement performance KW - Recycled materials KW - Rutting LA - English PB - Minnesota. Department of Transportation. Research Services & Library PY - 2026-01-01 SN - MN 2026-12 TI - Improving and Developing Pavement Design Inputs and Performance Functions for Cold Recycled Pavement Layers in Minnesota M3 - Tech Report N1 - United States N1 - (c)1036343 UR - https://rosap.ntl.bts.gov/view/dot/92355 ER -
Framing Camera Time-resolved Laser Induced Incandescence Measurements in a Rich Quench Lean Combustor

Douglas, Eric J. ;

Vishwanath, Rahul

2026-03-01 | PDF

Determining the size of soot particles in dynamic turbulent flames is critical for optimizing injector and combustor designs. In this work, we demonstrate the first use of a gigahertz-rate framing camera for planar time-resolved laser-induced incandescence (TiRe-LII) measurements in a rich quench lean (RQL) combustion system with Jet A fuel. In thi ...

07/06/2026

Title : Framing Camera Time-resolved Laser Induced Incandescence Measurements in a Rich Quench Lean Combustor Creator(s) : Douglas, Eric J.;Vishwanath, Rahul;Dhayal, Harshit;Steinberg, Adam;Sun, Wenting;Mazumdar, Yi Chen; Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment;Georgia Institute of Technology; Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Office of Environment and Energy Published Date : 2026-03-01 Report Number : FramingCameraTiReLII_ESSCI2026 URL : https://rosap.ntl.bts.gov/view/dot/92354 Douglas, Eric J. et al. (2026). Framing Camera Time-resolved Laser Induced Incandescence Measurements in a Rich Quench Lean Combustor. Douglas, Eric J. et al. "Framing Camera Time-resolved Laser Induced Incandescence Measurements in a Rich Quench Lean Combustor" (2026) Douglas, Eric J. et al. "Framing Camera Time-resolved Laser Induced Incandescence Measurements in a Rich Quench Lean Combustor" , 2026 Export RIS Citation Information. TY - Proceedings AU - Douglas, Eric J. AU - Vishwanath, Rahul AU - Dhayal, Harshit AU - Steinberg, Adam AU - Sun, Wenting AU - Mazumdar, Yi Chen A2 - United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment A2 - Georgia Institute of Technology A3 - United States. Department of Transportation. Federal Aviation Administration. Office of Environment and Energy AB - Determining the size of soot particles in dynamic turbulent flames is critical for optimizing injector and combustor designs. In this work, we demonstrate the first use of a gigahertz-rate framing camera for planar time-resolved laser-induced incandescence (TiRe-LII) measurements in a rich quench lean (RQL) combustion system with Jet A fuel. In this method, the framing camera is able to capture the background luminosity, prompt LII signal, and temporal incandescence decay at up to 40 MHz. This enables shorter time constant fits than any prior 2D TiRe-LII experiments, enhancing confidence in soot particle size and soot volume fraction estimates. Measurements are performed at a preheat temperature of 600 K, pressures ranging from 59 to 120 psig, and equivalence ratios from 0.26 to 0.29. Initial results show clear soot volume fraction and particle size changes with pressure and equivalence ratio. AB - Citation: Douglas, E. J., Vishwanath, R., Dhayal, H., Steinberg, A., Sun, W., & Mazumdar, Y. C. (2026). Framing Camera Time-resolved Laser Induced Incandescence Measurements in a Rich Quench Lean Combustor. Spring Technical Meeting, Eastern States Section of the Combustion Institute, March 15-18, 2026, Raleigh, NC AN - dot:92354 KW - Combustion KW - Lean fuel mixtures KW - Particles KW - Aviation fuels KW - ASCENT KW - High Pressure Combustion KW - Rich Quench Lean KW - Soot Particle Sizing KW - Laser Induced Incandescence (LII) LA - English PB - United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment PY - 2026-03-01 SN - FramingCameraTiReLII_ESSCI2026 TI - Framing Camera Time-resolved Laser Induced Incandescence Measurements in a Rich Quench Lean Combustor M3 - Proceedings N1 - United States N1 - 13-C-AJFE-GIT-080 N1 - Public Domain UR - https://rosap.ntl.bts.gov/view/dot/92354 ER -
A Techno-Economic, Carbon Intensity, and Policy Assessment of Hydrogen Production in the United States

Sierra-Jimenez, Valentina

;

Brandt, Kristin

2026-04-10 | PDF

Comparing studies that involve techno-economic analyses (TEA) and life cycle assessments (LCA) for different hydrogen production technologies is challenging due to inconsistent assumptions across studies. Thus, this research develops a harmonized framework to assess seven hydrogen production pathways - water electrolysis, methane pyrolysis, biomass ...

07/06/2026

Title : A Techno-Economic, Carbon Intensity, and Policy Assessment of Hydrogen Production in the United States Creator(s) : Sierra-Jimenez, Valentina;Brandt, Kristin;Garcia, Aidan;Garcia-Perez, Manuel;Wolcott, Michael P.; Corporate Creator(s) : Washington State University Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment Published Date : 2026-04-10 DOI : https://doi.org/10.1016/j.ijhydene.2026.154856 Sierra-Jimenez, Valentina et al. (2026). A Techno-Economic, Carbon Intensity, and Policy Assessment of Hydrogen Production in the United States. https://doi.org/10.1016/j.ijhydene.2026.154856 Sierra-Jimenez, Valentina et al. "A Techno-Economic, Carbon Intensity, and Policy Assessment of Hydrogen Production in the United States" (2026), https://doi.org/10.1016/j.ijhydene.2026.154856 Sierra-Jimenez, Valentina et al. "A Techno-Economic, Carbon Intensity, and Policy Assessment of Hydrogen Production in the United States" , 2026, https://doi.org/10.1016/j.ijhydene.2026.154856 Export RIS Citation Information. TY - Journal Article AU - Sierra-Jimenez, Valentina AU - Brandt, Kristin AU - Garcia, Aidan AU - Garcia-Perez, Manuel AU - Wolcott, Michael P. A2 - Washington State University A3 - United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment AB - Comparing studies that involve techno-economic analyses (TEA) and life cycle assessments (LCA) for different hydrogen production technologies is challenging due to inconsistent assumptions across studies. Thus, this research develops a harmonized framework to assess seven hydrogen production pathways - water electrolysis, methane pyrolysis, biomass gasification, steam methane reforming, autothermal reforming, partial oxidation, and dry methane reforming, under consistent U.S.-specific techno-economic, carbon intensity (CI), and policy assumptions. Process models developed with Aspen Plus produce mass and energy balances, informing opensource TEA and cradle-to-gate CI estimates. Thermal conversion pathways produce hydrogen at $0.8–$3.9/kg, while electrolysis-based methods range from $4.5–$18.5/kg, contingent on both electrolyzer and the source of electricity used. Several low-carbon emitting pathways meet emerging clean hydrogen standards, but only some achieve cost parity with conventional hydrogen under current U.S. federal and state incentives. This framework enables consistent cross-technology comparison and supports informed decisions on hydrogen sourcing, including applications such as sustainable aviation fuel production or fuel cell electric vehicles. AB - This is an open access article under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) license https://creativecommons.org/licenses/by/4.0/. Please cite this article as: Valentina Sierra-Jimenez, Kristin Brandt, Aidan Garcia, Manuel Garcia-Perez, Michael P. Wolcott, A techno-economic, carbon intensity, and policy assessment of hydrogen production in the United States, International Journal of Hydrogen Energy, Volume 231, 2026, 154856, ISSN 0360-3199, https://doi.org/10.1016/j.ijhydene.2026.154856. AN - dot:92353 DO - https://doi.org/10.1016/j.ijhydene.2026.154856 KW - Hydrogen production KW - Economic analysis KW - Policy making KW - Carbon KW - Costs KW - Decarbonization KW - Environmental protection KW - ASCENT LA - English PB - Elsevier PY - 2026-04-10 TI - A Techno-Economic, Carbon Intensity, and Policy Assessment of Hydrogen Production in the United States M3 - Journal Article N1 - United States N1 - Open Access; https://creativecommons.org/licenses/by/4.0/ UR - https://rosap.ntl.bts.gov/view/dot/92353 ER -
Atomization and Combustion Performance of Antimisting Kerosene and Jet Fuel

Fleeter, R. ;

Parikh, P.

1983-12-01 | PDF

Combustion performance of antimisting kerosene (AMK) containing FM-9 polymer developed by ICI-Americas has been investigated at various levels of degradation (restoration of AMK for normal use in a gas turbine engine). To establish the relationship of degradation and atomization to performance in an aircraft gas turbine combustor, sprays formed by ...

07/06/2026

Title : Atomization and Combustion Performance of Antimisting Kerosene and Jet Fuel Creator(s) : Fleeter, R.;Parikh, P.;Sarohia, V.; Corporate Creator(s) : California Institute of Technology, Pasadena. Jet Propulsion Laboratory Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Technical Center Published Date : 1983-12-01 Report Number : DOT/FAA/CT-82/150 URL : https://rosap.ntl.bts.gov/view/dot/92352 Fleeter, R. et al. (1983). Atomization and Combustion Performance of Antimisting Kerosene and Jet Fuel. Fleeter, R. and Parikh, P. and Sarohia, V. "Atomization and Combustion Performance of Antimisting Kerosene and Jet Fuel" (1983) Fleeter, R. et al. "Atomization and Combustion Performance of Antimisting Kerosene and Jet Fuel" , 1983 Export RIS Citation Information. TY - Tech Report AU - Fleeter, R. AU - Parikh, P. AU - Sarohia, V. A2 - California Institute of Technology, Pasadena. Jet Propulsion Laboratory A3 - United States. Department of Transportation. Federal Aviation Administration. Technical Center AB - Combustion performance of antimisting kerosene (AMK) containing FM-9 polymer developed by ICI-Americas has been investigated at various levels of degradation (restoration of AMK for normal use in a gas turbine engine). To establish the relationship of degradation and atomization to performance in an aircraft gas turbine combustor, sprays formed by the nozzle of a Pratt & Whitney JT8-D combustor with Jet A and AMK at 1 atmosphere (atm) (14.1 lb./in2 absolute) pressure and 220 C at several degradation levels were analyzed. A new spray characterization technique based on digital image analysis of high resolution, wide field spray images formed under pulsed ruby laser sheet illumination was developed. Combustion tests were performed for these fuels in a JT8-D single can combustor facility to measure combustion efficiency and the lean extinction limit. Correlation of combustion performance under simulated engine operating conditions with nozzle spray Sauter mean diameter (SMD) measured at 1 atm and 220 C has been observed. Fuel spray SMD and hence the combustion efficiency are strongly influenced by fuel degradation level. Use of even the most highly degraded AMK tested (filter ratio = 1.2) resulted in an increase in fuel consumption of 0.08% to 0.20% at engine cruise conditions. A bulk degrader for AMK was built, tested and used to prepare fuel for the combustion tests. The effect of moderate heating of the fuel on degrader performance was also investigated. AN - dot:92352 ET - Final Report KW - Fires KW - Combustion KW - Flammability KW - Aircraft fuels KW - Mist KW - Jet propelled aircraft LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1983-12-01 SN - DOT/FAA/CT-82/150 TI - Atomization and Combustion Performance of Antimisting Kerosene and Jet Fuel M3 - Tech Report N1 - United States N1 - DTFA03-80-A-00215 UR - https://rosap.ntl.bts.gov/view/dot/92352 ER -
Chip Seal for Uniform Usages Across the Districts of NMDOT

Vargas-Nordcbeck, Adriana ;

Chen, Chen

2025-11-01 | PDF

Chip seals are a cost-effective pavement preservation treatment widely used by the New Mexico Department of Transportation (NMDOT) to extend pavement life and improve surface performance. Despite their extensive application, NMDOT has not previously adopted a standardized design procedure or construction specification, resulting in variability acro ...

07/06/2026

Title : Chip Seal for Uniform Usages Across the Districts of NMDOT Creator(s) : Vargas-Nordcbeck, Adriana;Chen, Chen;Earls, Brooke;Mann, Jeffrey; Corporate Creator(s) : Auburn University. National Center for Asphalt Technology Corporate Contributor(s) : New Mexico. Department of Transportation Published Date : 2025-11-01 URL : https://rosap.ntl.bts.gov/view/dot/92351 Vargas-Nordcbeck, Adriana et al. (2025). Chip Seal for Uniform Usages Across the Districts of NMDOT. Vargas-Nordcbeck, Adriana et al. "Chip Seal for Uniform Usages Across the Districts of NMDOT" (2025) Vargas-Nordcbeck, Adriana et al. "Chip Seal for Uniform Usages Across the Districts of NMDOT" , 2025 Export RIS Citation Information. TY - Tech Report AU - Vargas-Nordcbeck, Adriana AU - Chen, Chen AU - Earls, Brooke AU - Mann, Jeffrey A2 - Auburn University. National Center for Asphalt Technology A3 - New Mexico. Department of Transportation AB - Chip seals are a cost-effective pavement preservation treatment widely used by the New Mexico Department of Transportation (NMDOT) to extend pavement life and improve surface performance. Despite their extensive application, NMDOT has not previously adopted a standardized design procedure or construction specification, resulting in variability across districts. This research reviewed current practices, analyzed performance trends using Pavement Management System (PMS) data, and developed a formal design methodology tailored to New Mexico’s conditions. The Modified Kearby method, documented in AASHTO R 102-22, was selected as the most suitable design approach based on its practicality and compatibility with available resources. Laboratory testing of 13 aggregate sources, including reclaimed asphalt pavement (RAP), revealed significant variability in material properties and application rates, confirming the need for project-specific design. Validation through two field projects demonstrated strong agreement between laboratory-designed and field-applied rates, supporting adoption of the method. PMS analysis showed that chip seals generally perform well, with minimal bleeding and acceptable aggregate retention. Service lives average six to eight years, consistent with current practice. The study recommends adopting the Modified Kearby method, implementing statewide specifications, integrating PMS data into project selection, and constructing pilot test sections in each district during initial implementation. These measures will improve consistency, optimize material usage, and enhance long-term performance of chip seal treatments across New Mexico. AN - dot:92351 ET - Final Report: 2023 - 2025 KW - Pavement performance KW - Pavement management systems KW - Preservation KW - Chip seals KW - Design methods KW - Performance KW - Guidelines KW - Laboratory tests KW - Data collection KW - Pavement preservation KW - field performance LA - English PB - New Mexico. Department of Transportation PY - 2025-11-01 TI - Chip Seal for Uniform Usages Across the Districts of NMDOT M3 - Tech Report N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/92351 ER -
Guidelines for Use and Design of Deep Foundations for Three-Sided Structures

Wang, Yao

;

Salgado, Rodrigo

2026-02-11 | PDF

Buried three-sided structures are widely used for roadway crossings and underpasses. Whereas spread footings are common, deep foundations are required when weak soils, scour risk, or site constraints exist. This study aimed to improve understanding of load-transfer mechanisms and develop guidance for the design of deep foundations supporting buried ...

07/06/2026

Title : Guidelines for Use and Design of Deep Foundations for Three-Sided Structures Creator(s) : Wang, Yao;Salgado, Rodrigo;Prezzi, Monica; Corporate Creator(s) : Purdue University. Joint Transportation Research Program Corporate Contributor(s) : Indiana Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 2026-02-11 Report Number : FHWA/IN/JTRP-2026/07 DOI : https://doi.org/10.5703/1288284318615 Wang, Yao et al. (2026). Guidelines for Use and Design of Deep Foundations for Three-Sided Structures. https://doi.org/10.5703/1288284318615 Wang, Yao and Salgado, Rodrigo and Prezzi, Monica "Guidelines for Use and Design of Deep Foundations for Three-Sided Structures" (2026), https://doi.org/10.5703/1288284318615 Wang, Yao et al. "Guidelines for Use and Design of Deep Foundations for Three-Sided Structures" , 2026, https://doi.org/10.5703/1288284318615 Export RIS Citation Information. TY - Tech Report AU - Wang, Yao AU - Salgado, Rodrigo AU - Prezzi, Monica A2 - Purdue University. Joint Transportation Research Program A3 - Indiana Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - Buried three-sided structures are widely used for roadway crossings and underpasses. Whereas spread footings are common, deep foundations are required when weak soils, scour risk, or site constraints exist. This study aimed to improve understanding of load-transfer mechanisms and develop guidance for the design of deep foundations supporting buried three-sided structures. A nationwide survey of 34 state DOT engineers and 12 three-dimensional finite element analyses were conducted. Results show that greater stem wall height and thicker earth cover lead to a more uniform live-load distribution between piles. The most critical condition occurs when the design truck is placed near the roadside, where piles beneath the loaded segment carry the greatest loads. When the truck is centered, the load distribution becomes nearly uniform, and the superposition principle approximately holds for well-designed to conservatively designed piles. Comparison with the traditional moment-of-inertia method indicates that the method overpredicts live loads by about 10%–50%. The study confirms that live-load moments are small enough to be neglected and that current design practice is conservative. These findings provide a rational basis for improved design guidance for pile-supported three-sided structures. AN - dot:92350 DO - https://doi.org/10.5703/1288284318615 ET - Final Report KW - Structures KW - Finite element method KW - Live loads KW - Support piles KW - Backfill soils KW - Surveys KW - Guidelines KW - three-sided structure LA - English PB - Purdue University. Joint Transportation Research Program PY - 2026-02-11 SN - FHWA/IN/JTRP-2026/07 TI - Guidelines for Use and Design of Deep Foundations for Three-Sided Structures M3 - Tech Report N1 - United States N1 - SPR-4732 UR - https://rosap.ntl.bts.gov/view/dot/92350 ER -
Bridge Inspection Using Augmented Reality and Artificial Intelligence

Gabbard, Joe ;

Sarlo, Rodrigo

2025-05-01 | PDF

Bridge inspections are critical for maintaining infrastructure safety and reliability, requiring inspectors to conduct thorough evaluations of structural components and document their conditions. However, traditional inspection workflows rely heavily on manual measurement and data entry, which introduces inefficiencies, inconsistencies, and transcr ...

07/06/2026

Title : Bridge Inspection Using Augmented Reality and Artificial Intelligence Creator(s) : Gabbard, Joe;Sarlo, Rodrigo; Corporate Creator(s) : Virginia Tech Corporate Contributor(s) : New Mexico. Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 2025-05-01 Report Number : CO4616 URL : https://rosap.ntl.bts.gov/view/dot/92349 Gabbard, Joe and Sarlo, Rodrigo (2025). Bridge Inspection Using Augmented Reality and Artificial Intelligence. Gabbard, Joe and Sarlo, Rodrigo "Bridge Inspection Using Augmented Reality and Artificial Intelligence" (2025) Gabbard, Joe and Sarlo, Rodrigo "Bridge Inspection Using Augmented Reality and Artificial Intelligence" , 2025 Export RIS Citation Information. TY - Tech Report AU - Gabbard, Joe AU - Sarlo, Rodrigo A2 - Virginia Tech A3 - New Mexico. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - Bridge inspections are critical for maintaining infrastructure safety and reliability, requiring inspectors to conduct thorough evaluations of structural components and document their conditions. However, traditional inspection workflows rely heavily on manual measurement and data entry, which introduces inefficiencies, inconsistencies, and transcription errors. The adoption of the Specification for the National Bridge Inventory (SNBI) has increased the complexity of these assessments, further highlighting the need for modernized inspection methods. This research explores the application of Augmented Reality (AR) and Computer Vision (CV) in bridge inspections through the development of an AR-based head-mounted display system. By overlaying digital annotations, enabling hands-free interaction, and integrating automated measurement tools, the proposed system supports enhanced data collection, visualization, and more efficient data conversion in the office. Through iterative design reviews, development and field testing with professional bridge inspectors, we built InpsectAR (an AR/CV App for bridge inspection) and evaluated the usability and practicality of various inspection techniques. Key findings from real-world testing indicate that AR improves spatial awareness by anchoring annotations and data directly to defects of interest on the bridge structure. The integration of CV for crack quantification has value for facilitating measurements at a distance, but its usability as a fully automated tool is low at this time. The team determined that the best way to ensure reliability in assessments was a hybrid approach where CV is guided by the inspector, with flexibility to bypass it altogether if preferred. AN - dot:92349 ET - Final Report KW - Bridge management systems KW - Computer vision KW - Inspection KW - Artificial intelligence KW - Augmented reality KW - Data collection KW - Safety KW - Bridge Inspection KW - User-Centered Design LA - English PB - New Mexico. Department of Transportation PY - 2025-05-01 SN - CO4616 TI - Bridge Inspection Using Augmented Reality and Artificial Intelligence M3 - Tech Report N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/92349 ER -
Comparing Resistivity and Conductivity in Metal Culverts

Collison, Jake

2025-12-04 | PDF

Before installing an underground metal culvert, certain soil characteristics need to be measured to calculate its expected service life. The service life of an underground culvert is a function of the expected amount of corrosion based on the soil, the type of culvert used, and water conditions. The New Mexico Department of Transportation (NMDOT) u ...

07/06/2026

Title : Comparing Resistivity and Conductivity in Metal Culverts Creator(s) : Collison, Jake Corporate Creator(s) : Agua del Sol Consultants, LLC. Corporate Contributor(s) : New Mexico. Department of Transportation Published Date : 2025-12-04 Report Number : CO6444 URL : https://rosap.ntl.bts.gov/view/dot/92348 Collison, Jake (2025). Comparing Resistivity and Conductivity in Metal Culverts. Collison, Jake "Comparing Resistivity and Conductivity in Metal Culverts" (2025) Collison, Jake "Comparing Resistivity and Conductivity in Metal Culverts" , 2025 Export RIS Citation Information. TY - Tech Report AU - Collison, Jake A2 - Agua del Sol Consultants, LLC. A3 - New Mexico. Department of Transportation AB - Before installing an underground metal culvert, certain soil characteristics need to be measured to calculate its expected service life. The service life of an underground culvert is a function of the expected amount of corrosion based on the soil, the type of culvert used, and water conditions. The New Mexico Department of Transportation (NMDOT) uses three different soil properties to estimate culvert service life: (1) the soil’s electrical conductivity (EC); (2) pH level; and (3) gypsum content. Soil EC measures how easily an electric charge can be passed (conducted)through the soil, with the soil’s moisture content having a large effect. Soils with pH lower than 5.5 and greater than 7.3 have been shown to have adverse effects on galvanized coated (zinc coating)steel culverts. Lastly, knowing the amount of gypsum (CaSO4 2H2O) in the soil is important because gypsum (specifically, the sulfates within the gypsum, SO42) readily corrodes zinc and steel. All three of these soil properties’ corrosive potential is further increased with higher moisture content in the soil. With culverts’ typical proximity to water, accurate accounting of these soil parameters is crucial in the determination of the type of culvert to be used, based on a minimum of 50 years of service life. This project used in-situ and laboratory measurements of soil conductivity and resistivity to determine the compatibility of the Natural Resource Conservation Service (NRCS) Soils Maps for metal corrosion potential versus the 2018 NMDOT Culvert Resistant Spreadsheet (CRS). AN - dot:92348 ET - Final Report 2025 KW - Metal culverts KW - Corrosion KW - Soil stabilization KW - Resistivity method KW - Field tests KW - Electrical conductivity KW - Moisture content KW - Gypsum KW - Soil Resistivity KW - Soil Conductivity LA - English PB - New Mexico. Department of Transportation PY - 2025-12-04 SN - CO6444 TI - Comparing Resistivity and Conductivity in Metal Culverts M3 - Tech Report N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/92348 ER -
Evaluation of Wind-Driven Retroreflective Taxiway Edge Markers

Brown, Guy S.

1982-12-01 | PDF

An innovative taxiway edge retroreflective marker, designed to rotate when there is sufficient wind, was evaluated to determine whether the markers would provide adequate visual guidance at night while rotating and when stationary, and whether the innovative rotating feature adds to or detracts from the guidance value. The evaluation was not intend ...

07/06/2026

Title : Evaluation of Wind-Driven Retroreflective Taxiway Edge Markers Creator(s) : Brown, Guy S. Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration. Technical Center Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Office of Systems Research and Development Published Date : 1982-12-01 Report Number : DOT/FAA/CT-82/131, DOT/FAA/RD-82/80 URL : https://rosap.ntl.bts.gov/view/dot/92347 Brown, Guy S. (1982). Evaluation of Wind-Driven Retroreflective Taxiway Edge Markers. Brown, Guy S. "Evaluation of Wind-Driven Retroreflective Taxiway Edge Markers" (1982) Brown, Guy S. "Evaluation of Wind-Driven Retroreflective Taxiway Edge Markers" , 1982 Export RIS Citation Information. TY - Tech Report AU - Brown, Guy S. A2 - United States. Department of Transportation. Federal Aviation Administration. Technical Center A3 - United States. Department of Transportation. Federal Aviation Administration. Office of Systems Research and Development AB - An innovative taxiway edge retroreflective marker, designed to rotate when there is sufficient wind, was evaluated to determine whether the markers would provide adequate visual guidance at night while rotating and when stationary, and whether the innovative rotating feature adds to or detracts from the guidance value. The evaluation was not intended to determine whether the device will or will not meet Federal Aviation Administration (FAA) Specifications. The markers consist of a plastic can or cylinder, 6 1/4 inches by 8 inches tall, mounted on plastic Polyvinyl Chloride (PVC) pipe. Wind collector vanes on the cylinder are used to rotate the cylinder when winds are above approximately 8 knots. Light is reflected at night from retroreflective bands of yellow and blue material and from glass beads imbedded in the painted material. The retroreflective bands of material are staggered vertically producing motion or movement both when rotating horizontally and vertically. AN - dot:92347 ET - Final Report KW - Visual aids KW - Airport runways KW - Retroreflectivity KW - Wind KW - Airport Taxiway Markers LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1982-12-01 SN - DOT/FAA/CT-82/131, DOT/FAA/RD-82/80 TI - Evaluation of Wind-Driven Retroreflective Taxiway Edge Markers M3 - Tech Report N1 - United States N1 - 081-502-580 UR - https://rosap.ntl.bts.gov/view/dot/92347 ER -
Behavioral Investigation of Temporary and Permanent Pedestrian Infrastructure

Craig, Curtis M. ;

Morris, Nichole L.

2026-01-01 | PDF

Agencies may treat pedestrian crossing sites initially with temporary treatments (i.e., removable flexible delineators or bollards) to test efficacy, but the pedestrian safety effects of temporary infrastructure are not well understood. This study tested the impact of temporary and permanent pedestrian infrastructure such as curb extensions/bump-ou ...

07/06/2026

Title : Behavioral Investigation of Temporary and Permanent Pedestrian Infrastructure Creator(s) : Craig, Curtis M.;Morris, Nichole L.;Katariya, Vinit;Tabkhi, Hamed; Corporate Creator(s) : University of Minnesota, Minneapolis;Local Road Research Board; Corporate Contributor(s) : Minnesota. Department of Transportation. Office of Research & Innovation Published Date : 2026-01-01 Report Number : MN 2026-08 URL : https://rosap.ntl.bts.gov/view/dot/92346 Craig, Curtis M. et al. (2026). Behavioral Investigation of Temporary and Permanent Pedestrian Infrastructure. Craig, Curtis M. et al. "Behavioral Investigation of Temporary and Permanent Pedestrian Infrastructure" (2026) Craig, Curtis M. et al. "Behavioral Investigation of Temporary and Permanent Pedestrian Infrastructure" , 2026 Export RIS Citation Information. TY - Tech Report AU - Craig, Curtis M. AU - Morris, Nichole L. AU - Katariya, Vinit AU - Tabkhi, Hamed A2 - University of Minnesota, Minneapolis A2 - Local Road Research Board A3 - Minnesota. Department of Transportation. Office of Research & Innovation AB - Agencies may treat pedestrian crossing sites initially with temporary treatments (i.e., removable flexible delineators or bollards) to test efficacy, but the pedestrian safety effects of temporary infrastructure are not well understood. This study tested the impact of temporary and permanent pedestrian infrastructure such as curb extensions/bump-outs and pedestrian medians/refuges as it relates to pedestrian and driver behavior. Twelve intersections in Minneapolis and Saint Paul, MN, comprising a mixture of intersection traffic control types and pedestrian infrastructure were examined before and after installation of the infrastructure. Staged pedestrian crossings by research staff at crosswalks examined driver stopping behavior and analyzed video data from installed traffic cameras to examine natural pedestrian behavior. A computer algorithm processed the video data to estimate vehicle speeds at the sites. For signalized intersections, the use of flexible delineators as a curb extension led to a reduced likelihood of drivers stopping for pedestrians during staged crossings. Little to no effect was found for permanent curb extensions at signalized intersections, perhaps due to the role that increased physical separation and visual complexity plays in the likelihood of drivers stopping for pedestrians. For unsignalized intersections, both temporary and permanent curb extensions were found to have similar and mixed effects for pedestrian safety when considering average driver speed, stopping likelihood, and pedestrian behavior. Both permanent and temporary medians had generally positive effects for the pedestrian safety measures, especially for average driver speed. Future research should closely examine the relative pedestrian safety impacts of temporary and permanent refuges at signalized intersections. AN - dot:92346 ET - Final Report KW - Pedestrians KW - Pedestrian safety KW - Driving behavior KW - Pedestrian areas KW - Signalized intersections KW - Temporary structures KW - Unsignalized intersections LA - English PB - Minnesota. Department of Transportation. Office of Research & Innovation PY - 2026-01-01 SN - MN 2026-08 TI - Behavioral Investigation of Temporary and Permanent Pedestrian Infrastructure M3 - Tech Report N1 - United States N1 - (c)1036342 (wo) 85 UR - https://rosap.ntl.bts.gov/view/dot/92346 ER -
Review of Aircraft Crash Structural Response Research

Witmer, Emmett A. ;

Steigmann, David J.

1982-08-01 | PDF

A review of aircraft crash structural response research has been carried out by studying the literature, discussions with researchers working in that area, and visits to facilitates/personnel involved in conducting and/or monitoring aircraft crash structural response investigations. Aircraft structures consisting of conventional built-up metallic c ...

07/06/2026

Title : Review of Aircraft Crash Structural Response Research Creator(s) : Witmer, Emmett A.;Steigmann, David J.; Corporate Creator(s) : Massachusetts Institute of Technology. Department of Aeronautics and Astronautics Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Technical Center Published Date : 1982-08-01 Report Number : DOT/FAA/CT-82/152 URL : https://rosap.ntl.bts.gov/view/dot/92345 Witmer, Emmett A. and Steigmann, David J. (1982). Review of Aircraft Crash Structural Response Research. Witmer, Emmett A. and Steigmann, David J. "Review of Aircraft Crash Structural Response Research" (1982) Witmer, Emmett A. and Steigmann, David J. "Review of Aircraft Crash Structural Response Research" , 1982 Export RIS Citation Information. TY - Tech Report AU - Witmer, Emmett A. AU - Steigmann, David J. A2 - Massachusetts Institute of Technology. Department of Aeronautics and Astronautics A3 - United States. Department of Transportation. Federal Aviation Administration. Technical Center AB - A review of aircraft crash structural response research has been carried out by studying the literature, discussions with researchers working in that area, and visits to facilitates/personnel involved in conducting and/or monitoring aircraft crash structural response investigations. Aircraft structures consisting of conventional built-up metallic construction and those consisting of advanced composite materials were of interest. The latter type of material and construction is of particular interest since their use is expanding rapidly, and crashworthiness of such structures is of increasing importance. Some recent theoretical and experimental studies of the behavior of composite-material structures subjected to severe static, dynamic, and/or impact conditions are noted. Such topics as crashworthiness testing of composite fuselage structures, the impact resistance of graphite and hybrid configurations, and the effects of elastomeric additives on the mechanical properties of epoxy resin and composite systems are reviewed. A review is made of some current and planned research to investigate experimentally the mechanical failure, post failure, and energy-absorbing behavior of a sequence of composite-material structural elements and structural assemblages subjected to static loads or to simulated crash-impact loads. AN - dot:92345 ET - Final Report KW - Aircraft KW - Crash investigation KW - Aviation safety KW - Crashworthiness KW - Structural damage KW - Simulation KW - Composite materials KW - Fiber reinforced plastics LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1982-08-01 SN - DOT/FAA/CT-82/152 TI - Review of Aircraft Crash Structural Response Research M3 - Tech Report N1 - United States N1 - F33615-77-C-5155, Task POOOlO UR - https://rosap.ntl.bts.gov/view/dot/92345 ER -
Fire Hazard Evaluation of BART Vehicles

Braun, Emil

1978-03-01 | PDF

A fire hazard evaluation of the subway cars used on the San Francisco Bay Area Rapid Transit District was performed. After analyzing the cars' interior and exterior design, five recommendations were made that, if implemented, would improve passenger safety by decreasing the probability of developing a hazardous fire situation. Among these recommend ...

07/06/2026

Title : Fire Hazard Evaluation of BART Vehicles Creator(s) : Braun, Emil Corporate Creator(s) : United States. Department of Commerce. National Bureau of Standards Corporate Contributor(s) : United States. Department of Transportation. Urban Mass Transportation Administration Published Date : 1978-03-01 Report Number : NBSIR 78-1421 URL : https://rosap.ntl.bts.gov/view/dot/92344 Braun, Emil (1978). Fire Hazard Evaluation of BART Vehicles. Braun, Emil "Fire Hazard Evaluation of BART Vehicles" (1978) Braun, Emil "Fire Hazard Evaluation of BART Vehicles" , 1978 Export RIS Citation Information. TY - Tech Report AU - Braun, Emil A2 - United States. Department of Commerce. National Bureau of Standards A3 - United States. Department of Transportation. Urban Mass Transportation Administration AB - A fire hazard evaluation of the subway cars used on the San Francisco Bay Area Rapid Transit District was performed. After analyzing the cars' interior and exterior design, five recommendations were made that, if implemented, would improve passenger safety by decreasing the probability of developing a hazardous fire situation. Among these recommendations were the upgrading of current upholstered urethane seat assemblies and the need for the development of a fire detection system appropriate for rapid rail transit vehicles. Those system improvements would not only provide passengers a safer traveling environment but would also provide a modest level of protection for the heavy investment in rail vehicles. AN - dot:92344 ET - Final Report KW - Design KW - Evaluation KW - Fire causes KW - Fire prevention KW - Fires KW - Public transit KW - Rapid transit cars KW - Urban transportation KW - Safety KW - fire accidents fire hazards KW - fire safety KW - fire scenarios KW - mass transportation KW - material fire performance KW - rail vehicles KW - subway car design KW - UNTA LA - English PB - United States. Department of Transportation. Urban Mass Transportation Administration PY - 1978-03-01 SN - NBSIR 78-1421 TI - Fire Hazard Evaluation of BART Vehicles M3 - Tech Report N1 - United States N1 - DOT-AT-70007 UR - https://rosap.ntl.bts.gov/view/dot/92344 ER -
A Study of Bird Ingestions into Large High Bypass Ratio Turbine Aircraft Engines [Interim]

Frings, Gary

1983-03-01 | PDF

A 1-year study has been conducted to document the numbers, weights, and species of birds being ingested into large high bypass ratio aircraft turbine engines. This study will continue into a second year. This interim report presents the findings to date.

07/06/2026

Title : A Study of Bird Ingestions into Large High Bypass Ratio Turbine Aircraft Engines [Interim] Creator(s) : Frings, Gary Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration. Technical Center Published Date : 1983-03-01 Report Number : DOT/FAA/CT-82/144 URL : https://rosap.ntl.bts.gov/view/dot/92343 Frings, Gary (1983). A Study of Bird Ingestions into Large High Bypass Ratio Turbine Aircraft Engines [Interim]. Frings, Gary "A Study of Bird Ingestions into Large High Bypass Ratio Turbine Aircraft Engines [Interim]" (1983) Frings, Gary "A Study of Bird Ingestions into Large High Bypass Ratio Turbine Aircraft Engines [Interim]" , 1983 Export RIS Citation Information. TY - Tech Report AU - Frings, Gary A2 - United States. Department of Transportation. Federal Aviation Administration. Technical Center AB - A 1-year study has been conducted to document the numbers, weights, and species of birds being ingested into large high bypass ratio aircraft turbine engines. This study will continue into a second year. This interim report presents the findings to date. AN - dot:92343 ET - Interim Report KW - Air transportation crashes KW - Aircraft operations KW - Aircraft pilotage KW - Aviation safety KW - Bird strikes KW - Turbine engines LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1983-03-01 SN - DOT/FAA/CT-82/144 TI - A Study of Bird Ingestions into Large High Bypass Ratio Turbine Aircraft Engines [Interim] M3 - Tech Report N1 - United States N1 - 182-320-100 UR - https://rosap.ntl.bts.gov/view/dot/92343 ER -
Beyond Traffic 2045

United States. Department of Transportation

2015-01-01 | PDF

Pamphlet examining trends and data that address the future of the United States transportation system by the year 2045.

07/06/2026

Title : Beyond Traffic 2045 Corporate Creator(s) : United States. Department of Transportation Published Date : 2015-01-01 DOI : https://doi.org/10.21949/2cvb-k462 United States. Department of Transportation (2015). Beyond Traffic 2045. https://doi.org/10.21949/2cvb-k462 United States. Department of Transportation "Beyond Traffic 2045" (2015), https://doi.org/10.21949/2cvb-k462 United States. Department of Transportation "Beyond Traffic 2045" , 2015, https://doi.org/10.21949/2cvb-k462 Export RIS Citation Information. TY - Booklet/Pamphlet A2 - United States. Department of Transportation AB - Pamphlet examining trends and data that address the future of the United States transportation system by the year 2045. AN - dot:92342 DO - https://doi.org/10.21949/2cvb-k462 KW - Transportation planning KW - Economic and social factors KW - Environmental impacts KW - Predictive models KW - Travel KW - Transportation operations LA - English PB - United States. Department of Transportation PY - 2015-01-01 TI - Beyond Traffic 2045 M3 - Booklet/Pamphlet N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/92342 ER -
The CAA

United States. Department of Commerce. Civil Aeronautics Administration

1948-06-01 | PDF

Pamphlet from 1948 describing the mission and organization of the Civil Aeronautics Administration (CAA), which was a predecessor to the Federal Aviation Administration.

07/06/2026

Title : The CAA Corporate Creator(s) : United States. Department of Commerce. Civil Aeronautics Administration Published Date : 1948-06-01 DOI : https://doi.org/10.21949/9ass-rg61 United States. Department of Commerce. Civil Aeronautics Administration (1948). The CAA. https://doi.org/10.21949/9ass-rg61 United States. Department of Commerce. Civil Aeronautics Administration "The CAA" (1948), https://doi.org/10.21949/9ass-rg61 United States. Department of Commerce. Civil Aeronautics Administration "The CAA" , 1948, https://doi.org/10.21949/9ass-rg61 Export RIS Citation Information. TY - Booklet/Pamphlet A2 - United States. Department of Commerce. Civil Aeronautics Administration AB - Pamphlet from 1948 describing the mission and organization of the Civil Aeronautics Administration (CAA), which was a predecessor to the Federal Aviation Administration. AN - dot:92341 DO - https://doi.org/10.21949/9ass-rg61 KW - Federal government agencies KW - Aviation KW - Operations KW - Management and organization KW - Airways LA - English PB - United States. Department of Commerce. Civil Aeronautics Administration PY - 1948-06-01 TI - The CAA M3 - Booklet/Pamphlet N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/92341 ER -

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