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Showing 421 - 440 of 637 results

Computer Vision-Based Contactless Estimation of Asphalt Pavement Surface Friction

Al-Qadi, Imad L.

;

Golparvar-Fard, Mani

2026-09-01 | PDF

This study developed a contactless and automated technique to estimate hot-mix asphalt pavement surface friction by combining computer vision image-based 3D reconstruction with machine learning. Existing continuous friction estimation equipment, including high-speed laser scanners, are costly to purchase and operate-limiting routine, frequent monit ...

10/05/2026

Title : Computer Vision-Based Contactless Estimation of Asphalt Pavement Surface Friction Creator(s) : Al-Qadi, Imad L.;Golparvar-Fard, Mani;Fakhreddine, Mohammad;Lang, Hong;Villamil, William D.; Corporate Creator(s) : Illinois Center for Transportation;University of Illinois at Urbana-Champaign; Corporate Contributor(s) : Illinois. Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 2026-09-01 Report Number : FHWA-ICT-26-017;UILU-2026-2019; DOI : https://doi.org/10.36501/0197-9191/26-019
Al-Qadi, I. L., Golparvar-Fard, M., Fakhreddine, M., Lang, H., & Villamil, W. D. (2026). Computer Vision-Based Contactless Estimation of Asphalt Pavement Surface Friction (Report No. FHWA-ICT-26-017). Illinois Center for Transportation. https://doi.org/10.36501/0197-9191/26-019

Al-Qadi, Imad L., Mani Golparvar-Fard, Mohammad Fakhreddine, Hong Lang, and William D. Villamil. Computer Vision-Based Contactless Estimation of Asphalt Pavement Surface Friction. Report no. FHWA-ICT-26-017. Illinois Center for Transportation, 2026. https://doi.org/10.36501/0197-9191/26-019.

Al-Qadi, Imad L., et al. Computer Vision-Based Contactless Estimation of Asphalt Pavement Surface Friction. Illinois Center for Transportation, 2026, Report no. FHWA-ICT-26-017, ROSA P. https://doi.org/10.36501/0197-9191/26-019.
Export RIS Citation Information. TY - Tech Report AU - Al-Qadi, Imad L. AU - Golparvar-Fard, Mani AU - Fakhreddine, Mohammad AU - Lang, Hong AU - Villamil, William D. A2 - Illinois Center for Transportation A2 - University of Illinois at Urbana-Champaign A3 - Illinois. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - This study developed a contactless and automated technique to estimate hot-mix asphalt pavement surface friction by combining computer vision image-based 3D reconstruction with machine learning. Existing continuous friction estimation equipment, including high-speed laser scanners, are costly to purchase and operate-limiting routine, frequent monitoring. This study addressed this limitation through the development and utilization of cost-effective and scalable equipment. A Structure-from-Motion computer vision framework was developed to reconstruct pavement macrotexture in three dimensions and compute mean profile depth (MPD). Ground-control-based measurements agreed with a reference laser scanner within 15% across all test locations. A high-speed prototype using industrial cameras and a real-time kinematic positioning system was built. It was able to collect data up to 35 mi/hr and perform 3D reconstruction on cloud environments, increasing processing speed. The prototype was validated against a laser scanner at a controlled test track. The results demonstrated that contactless texture measurement and friction prediction are feasible and provide a foundation for more frequent, lower-cost monitoring of pavement surface characteristics, supporting proactive pavement management, safety screening, and more cost-effective maintenance decisions. The developed device measures texture and estimates friction for $61/mile, about 65% less than the $140/mile needed to collect both with current methods, and it costs only $73,500 to buy, compared with about $1,100,000 for a combined laser scanner and a transverse profiler. In addition, a data-driven model was developed to predict sideways friction measured by a Sideway-force Coefficient Routine Investigation Machine using pavement texture, traffic, roadway geometry, operating speed, and surface temperature. Three datasets collected in Florida and Illinois were used to evaluate the influence of dataset size, available features, and data distribution. Among the tree-based ensemble models evaluated, the Extra Trees model performed best, explaining approximately 85% of the variance, with MPD, traffic, operating speed, and surface temperature identified as the most influential variables. Finally, a finite element framework coupling a 3D tire model, texture-based friction model, and water film was developed to evaluate hydroplaning. The framework demonstrated that coarser macrotextures resulted in relatively better tire-pavement contact at higher speeds because of their improved surface drainage capacity. AN - dot:93746 DA - 2026-09-01 DO - https://doi.org/10.36501/0197-9191/26-019 ET - Final Report 7/1/22-9/30/26 KW - Pavement maintenance KW - Friction KW - Asphalt pavements KW - Photogrammetry KW - Machine learning KW - Hydroplaning KW - Transportation safety KW - Estimates KW - Microtexture KW - Hot mix asphalt KW - Datasets KW - Computer vision KW - Pavement Friction KW - Pavement Macrotexture LA - English PB - Illinois Center for Transportation PY - 2026 SN - FHWA-ICT-26-017 TI - Computer Vision-Based Contactless Estimation of Asphalt Pavement Surface Friction M3 - Tech Report N1 - United States N1 - R27-247 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93746 ER -
Denver Metropolitan Area Asphalt Pavement Mix Design Recommendations

Cheever, John ;

Donnelly, Denis, E.

1994-10-01 | PDF

It has been estimated that over 60 asphalt mix designs are being specified by the various local governments and design consultants in the Denver metropolitan area. As material batches are ordered for delivery to these various agencies, the producers are required to constantly change their mixing formulations and plant operations. This constantly ch ...

10/05/2026

Title : Denver Metropolitan Area Asphalt Pavement Mix Design Recommendations Creator(s) : Cheever, John;Donnelly, Denis, E.;Ferguson, Thom;LaForce, Bob;Potter, Dave;Sands, Scott;Zamora, Rich; Corporate Creator(s) : Denver Metropolitan Government Pavement Engineers Council;Metro Mix Design Task Force; Corporate Contributor(s) : Colorado. Department of Transportation Published Date : 1994-10-01 Report Number : CDOT-DTD-R-94-10 URL : https://rosap.ntl.bts.gov/view/dot/93745
Cheever, J., Donnelly, D. E., Ferguson, T., LaForce, B., Potter, D., Sands, S., & Zamora, R. (1994). Denver Metropolitan Area Asphalt Pavement Mix Design Recommendations (Report No. CDOT-DTD-R-94-10). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93745

Cheever, John, Denis, E. Donnelly, Thom Ferguson, Bob LaForce, Dave Potter, Scott Sands, and Rich Zamora. Denver Metropolitan Area Asphalt Pavement Mix Design Recommendations. Report no. CDOT-DTD-R-94-10. Colorado. Department of Transportation, 1994. https://rosap.ntl.bts.gov/view/dot/93745.

Cheever, John, et al. Denver Metropolitan Area Asphalt Pavement Mix Design Recommendations. Colorado. Department of Transportation, 1994, Report no. CDOT-DTD-R-94-10, ROSA P. https://rosap.ntl.bts.gov/view/dot/93745.
Export RIS Citation Information. TY - Tech Report AU - Cheever, John AU - Donnelly, Denis, E. AU - Ferguson, Thom AU - LaForce, Bob AU - Potter, Dave AU - Sands, Scott AU - Zamora, Rich A2 - Denver Metropolitan Government Pavement Engineers Council A2 - Metro Mix Design Task Force A3 - Colorado. Department of Transportation AB - It has been estimated that over 60 asphalt mix designs are being specified by the various local governments and design consultants in the Denver metropolitan area. As material batches are ordered for delivery to these various agencies, the producers are required to constantly change their mixing formulations and plant operations. This constantly changing process results in inefficiencies in production time and cost to the buyer, as well as variability in the process. The problem is intensified when towns and communities order small amounts of material for a local street project. In March, 1994 a Government Forum was held in conjunction with the annual meeting of the Colorado Asphalt Pavement Association. At this forum, a decision was made to organize a Task Force to address this problem and provide recommendations for asphalt paving materials in the Denver Metropolitan area. This report presents the recommendations of that Task Force. The recommendations include gradation, asphalt cement type, additives, RAP, voids, and laboratory design properties. Four standard mixes were identified. AN - dot:93745 DA - 1994-10-01 KW - Additives KW - Aggregate gradation KW - Air voids KW - Asphalt cement KW - Asphalt mixtures KW - Mix design KW - Properties of materials KW - Recommendations KW - Recycled materials LA - English PB - Colorado. Department of Transportation PY - 1994 SN - CDOT-DTD-R-94-10 TI - Denver Metropolitan Area Asphalt Pavement Mix Design Recommendations M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93745 ER -
Dynamic Measurements on Penetrometers for Determination of Foundation Design Parameters

Goble, G. G. ;

Aboumatar, Hasan

1994-11-01 | PDF

The historical background of the Standard Penetration Test (SPT) is reviewed with particular emphasis of those efforts to make dynamic measurements during the driving operation. The mechanics of one dimensional wave propagation is reviewed with emphasis on those aspects of the theory that applies to SPT operations. During the course of the project ...

10/05/2026

Title : Dynamic Measurements on Penetrometers for Determination of Foundation Design Parameters Creator(s) : Goble, G. G.;Aboumatar, Hasan; Corporate Creator(s) : University of Colorado at Boulder. Dept. of Civil, Environmental and Architectural Engineering Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration;Colorado. Department of Transportation; Published Date : 1994-11-01 Report Number : CDOH-DTD-R-94 URL : https://rosap.ntl.bts.gov/view/dot/93744
Goble, G. G., & Aboumatar, H. (1994). Dynamic Measurements on Penetrometers for Determination of Foundation Design Parameters (Report No. CDOH-DTD-R-94). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93744

Goble, G. G. and Hasan Aboumatar. Dynamic Measurements on Penetrometers for Determination of Foundation Design Parameters. Report no. CDOH-DTD-R-94. Colorado. Department of Transportation, 1994. https://rosap.ntl.bts.gov/view/dot/93744.

Goble, G. G., and Hasan Aboumatar Dynamic Measurements on Penetrometers for Determination of Foundation Design Parameters. Colorado. Department of Transportation, 1994, Report no. CDOH-DTD-R-94, ROSA P. https://rosap.ntl.bts.gov/view/dot/93744.
Export RIS Citation Information. TY - Tech Report AU - Goble, G. G. AU - Aboumatar, Hasan A2 - University of Colorado at Boulder. Dept. of Civil, Environmental and Architectural Engineering A3 - United States. Department of Transportation. Federal Highway Administration A3 - Colorado. Department of Transportation AB - The historical background of the Standard Penetration Test (SPT) is reviewed with particular emphasis of those efforts to make dynamic measurements during the driving operation. The mechanics of one dimensional wave propagation is reviewed with emphasis on those aspects of the theory that applies to SPT operations. During the course of the project it was discovered that the accuracy of measurements produced by available accelerometers was questionable. A major effort was devoted to testing accelerometers in the laboratory and evaluating the results. A wave of mechanics analysis of both the Safety Hammer and the CME Automatic Hammer is presented and shown to agree closely with measurements. The conclusion was reached that the measurement system is now accurate and reasonably reliable. Measurements were made at field sites to evaluate the ability to calculate Wave Equations soil constants. Force and motion was calculated at the sampler from the top measurements. Results are presented for two different conditions. These results must be considered as preliminary, but they offer justification for optimism in the future use of the method. AN - dot:93744 DA - 1994-11-01 ET - Final Report KW - Dynamic tests KW - Force KW - Standards KW - Foundations KW - Soil penetration test KW - Laboratory tests KW - response KW - acceleration KW - SPT LA - English PB - Colorado. Department of Transportation PY - 1994 SN - CDOH-DTD-R-94 TI - Dynamic Measurements on Penetrometers for Determination of Foundation Design Parameters M3 - Tech Report N1 - United States N1 - HPR 1488A DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93744 ER -
Test and Evaluation Plan for Determining Screener Training Effectiveness

Klock, Brenda A. ;

Fobes, J. L.

1999-04-01 | PDF

The efficacy of Computer-Based Training (CBT) programs, potentially useful for security checkpoint screener training, will be evaluated at three different airports. Candidates will be trained with one of three CBT programs or the Air Transport Association-approved classroom training program. The Screener Readiness Test, designed to assess screening ...

10/05/2026

Title : Test and Evaluation Plan for Determining Screener Training Effectiveness Creator(s) : Klock, Brenda A.;Fobes, J. L.; Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. Office of Aviation Security Research and Development Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Associate Administrator for Civil Aviation Security, ACS-1 Contributor(s) : Rubinstein, Joshua;Maguire, William; Published Date : 1999-04-01 Report Number : DOT/FAA/AR-99142 URL : https://rosap.ntl.bts.gov/view/dot/93743
Klock, B. A., & Fobes, J. L. (1999). Test and Evaluation Plan for Determining Screener Training Effectiveness (Report No. DOT/FAA/AR-99142). United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. https://rosap.ntl.bts.gov/view/dot/93743

Klock, Brenda A. and J. L. Fobes. Test and Evaluation Plan for Determining Screener Training Effectiveness. Report no. DOT/FAA/AR-99142. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1999. https://rosap.ntl.bts.gov/view/dot/93743.

Klock, Brenda A., and J. L. Fobes Test and Evaluation Plan for Determining Screener Training Effectiveness. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1999, Report no. DOT/FAA/AR-99142, ROSA P. https://rosap.ntl.bts.gov/view/dot/93743.
Export RIS Citation Information. TY - Tech Report AU - Klock, Brenda A. AU - Fobes, J. L. A2 - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. Office of Aviation Security Research and Development A3 - United States. Department of Transportation. Federal Aviation Administration. Associate Administrator for Civil Aviation Security, ACS-1 AB - The efficacy of Computer-Based Training (CBT) programs, potentially useful for security checkpoint screener training, will be evaluated at three different airports. Candidates will be trained with one of three CBT programs or the Air Transport Association-approved classroom training program. The Screener Readiness Test, designed to assess screening-related knowledge, will then be used to evaluate the effectiveness of these programs. AN - dot:93743 DA - 1999-04-01 KW - Aircraft KW - Airports KW - Security KW - Baggage screening KW - Detectors KW - Information display systems KW - Explosives detectors KW - Human factors engineering KW - Test procedures KW - Tests KW - Warning systems KW - X rays KW - Reliability KW - Training KW - Computer aided instruction KW - Evaluation KW - Performance evaluations KW - Personnel development KW - Training programs KW - Aviation security KW - Checkpoint screeners KW - On job training KW - Program evaluation KW - Screener Readiness Test KW - Security personn LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1999 SN - DOT/FAA/AR-99142 TI - Test and Evaluation Plan for Determining Screener Training Effectiveness M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93743 ER -
Aviation Screener On-the-Job Training Assessment - Content Outlines

Monichetti, Susan B. ;

Fobes, J. L.

1999-04-01 | PDF

Airport observations of screener on-the-job training indicated the need for a standardized set of performance evaluation objectives for each checkpoint task (X-ray, magnetometer, wanding/physical search, bag check, and exit lane). These objectives were based on the critical skills and abilities identified in the first phase of this effort. These ou ...

10/05/2026

Title : Aviation Screener On-the-Job Training Assessment - Content Outlines Creator(s) : Monichetti, Susan B.;Fobes, J. L.;Neiderman, Eric C.; Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Associate Administrator for Civil Aviation Security, ACS-1 Published Date : 1999-04-01 Report Number : DOT/FAA/AR-99/36 URL : https://rosap.ntl.bts.gov/view/dot/93742
Monichetti, S. B., Fobes, J. L., & Neiderman, E. C. (1999). Aviation Screener On-the-Job Training Assessment - Content Outlines (Report No. DOT/FAA/AR-99/36). United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. https://rosap.ntl.bts.gov/view/dot/93742

Monichetti, Susan B., J. L. Fobes, and Eric C. Neiderman. Aviation Screener On-the-Job Training Assessment - Content Outlines. Report no. DOT/FAA/AR-99/36. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1999. https://rosap.ntl.bts.gov/view/dot/93742.

Monichetti, Susan B., et al. Aviation Screener On-the-Job Training Assessment - Content Outlines. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1999, Report no. DOT/FAA/AR-99/36, ROSA P. https://rosap.ntl.bts.gov/view/dot/93742.
Export RIS Citation Information. TY - Tech Report AU - Monichetti, Susan B. AU - Fobes, J. L. AU - Neiderman, Eric C. A2 - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center A3 - United States. Department of Transportation. Federal Aviation Administration. Associate Administrator for Civil Aviation Security, ACS-1 AB - Airport observations of screener on-the-job training indicated the need for a standardized set of performance evaluation objectives for each checkpoint task (X-ray, magnetometer, wanding/physical search, bag check, and exit lane). These objectives were based on the critical skills and abilities identified in the first phase of this effort. These outlines will form the basis for developing the formal on-the-job training (OJT) Mastery Test and provide a framework from which a comprehensive and standardized training program can be based. AN - dot:93742 DA - 1999-04-01 KW - Abilities KW - Aviation safety KW - Baggage screening KW - Security KW - Security checkpoints LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1999 SN - DOT/FAA/AR-99/36 TI - Aviation Screener On-the-Job Training Assessment - Content Outlines M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93742 ER -
Characterization of Early Stages of Corrosion Fatigue in Aircraft Skin - Phase II: Interpretation of Corrosion-Fatigue Fracture Surfaces in Alclad 2024-T3 Aluminum Alloy Sheet

Schmidt, C. G. ;

Kobayashi, T.

1999-05-01 | PDF

New methods were developed and applied to extract and interpret information from the fracture surfaces of corrosion-fatigue specimens of clad and bare 2024-T3 aluminum sheet. We developed two fracture surface topography analysis methods that characterize the effects of environment and a fracture surface analysis and finite element modeling approach ...

10/05/2026

Title : Characterization of Early Stages of Corrosion Fatigue in Aircraft Skin - Phase II: Interpretation of Corrosion-Fatigue Fracture Surfaces in Alclad 2024-T3 Aluminum Alloy Sheet Creator(s) : Schmidt, C. G.;Kobayashi, T.;Shockey, D. A.; Corporate Creator(s) : SRI International Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Office of Aviation Research Published Date : 1999-05-01 Report Number : DOT/FAA/AR-99/34 URL : https://rosap.ntl.bts.gov/view/dot/93741
Schmidt, C. G., Kobayashi, T., & Shockey, D. A. (1999). Characterization of Early Stages of Corrosion Fatigue in Aircraft Skin - Phase II: Interpretation of Corrosion-Fatigue Fracture Surfaces in Alclad 2024-T3 Aluminum Alloy Sheet (Report No. DOT/FAA/AR-99/34). United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. https://rosap.ntl.bts.gov/view/dot/93741

Schmidt, C. G., T. Kobayashi, and D. A. Shockey. Characterization of Early Stages of Corrosion Fatigue in Aircraft Skin - Phase II: Interpretation of Corrosion-Fatigue Fracture Surfaces in Alclad 2024-T3 Aluminum Alloy Sheet. Report no. DOT/FAA/AR-99/34. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1999. https://rosap.ntl.bts.gov/view/dot/93741.

Schmidt, C. G., et al. Characterization of Early Stages of Corrosion Fatigue in Aircraft Skin - Phase II: Interpretation of Corrosion-Fatigue Fracture Surfaces in Alclad 2024-T3 Aluminum Alloy Sheet. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1999, Report no. DOT/FAA/AR-99/34, ROSA P. https://rosap.ntl.bts.gov/view/dot/93741.
Export RIS Citation Information. TY - Tech Report AU - Schmidt, C. G. AU - Kobayashi, T. AU - Shockey, D. A. A2 - SRI International A3 - United States. Department of Transportation. Federal Aviation Administration. Office of Aviation Research AB - New methods were developed and applied to extract and interpret information from the fracture surfaces of corrosion-fatigue specimens of clad and bare 2024-T3 aluminum sheet. We developed two fracture surface topography analysis methods that characterize the effects of environment and a fracture surface analysis and finite element modeling approach to detect and quantify overloads that occurred during fatigue crack propagation. We used these methods to perform a detailed analysis of the fracture surface topography produced in the early stages of corrosion fatigue, and developed an understanding of the effect of environment on the crack nucleation mechanism based on fracture surface features. AN - dot:93741 DA - 1999-05-01 ET - Phase II Report KW - Aircraft structural components KW - Airplanes KW - Corrosion KW - Fatigue cracking LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1999 SN - DOT/FAA/AR-99/34 TI - Characterization of Early Stages of Corrosion Fatigue in Aircraft Skin - Phase II: Interpretation of Corrosion-Fatigue Fracture Surfaces in Alclad 2024-T3 Aluminum Alloy Sheet M3 - Tech Report N1 - United States N1 - 95-G-065 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93741 ER -
Preliminary Procedure to Predict Scour in Bedrock

Smith, Steven P.

1994-12-01 | PDF

The primary goal of this study is to develop a procedure to predict scour depths in bedrock that accounts for both the hydraulic conditions at the bridge site and the bedrock's ability to resist erosion. A methodology for determining material erodibility resulting from the erosive power of water has been presented by Annandale (1993, 1995). He intr ...

10/05/2026

Title : Preliminary Procedure to Predict Scour in Bedrock Creator(s) : Smith, Steven P. Corporate Creator(s) : Colorado. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 1994-12-01 Report Number : CDOT-R-SD-94-14 URL : https://rosap.ntl.bts.gov/view/dot/93740
Smith, S. P. (1994). Preliminary Procedure to Predict Scour in Bedrock (Report No. CDOT-R-SD-94-14). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93740

Smith, Steven P.. Preliminary Procedure to Predict Scour in Bedrock. Report no. CDOT-R-SD-94-14. Colorado. Department of Transportation, 1994. https://rosap.ntl.bts.gov/view/dot/93740.

Smith, Steven P. Preliminary Procedure to Predict Scour in Bedrock. Colorado. Department of Transportation, 1994, Report no. CDOT-R-SD-94-14, ROSA P. https://rosap.ntl.bts.gov/view/dot/93740.
Export RIS Citation Information. TY - Tech Report AU - Smith, Steven P. A2 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - The primary goal of this study is to develop a procedure to predict scour depths in bedrock that accounts for both the hydraulic conditions at the bridge site and the bedrock's ability to resist erosion. A methodology for determining material erodibility resulting from the erosive power of water has been presented by Annandale (1993, 1995). He introduced a relationship between stream power and a geomechanical material classification system known as the erodibility index. This report applies his findings to bridge scour analysis and presents an interim procedure for estimating bridge scour depths in bedrock and other materials defined by the erodibility index. The recommendations in this report are currently being applied as an interim method for evaluating bridge scour at the Colorado Department of Transportation. Further laboratory study is planned to refine the relationship between energy dissipation at bridge piers and pier geometry. Findings from this study will be made available in a subsequent report. AN - dot:93740 DA - 1994-12-01 ET - Interim Report: 12/93 to 09/94 KW - Bridges KW - Scour KW - Bedrock KW - Depth KW - Estimating KW - Forecasting KW - Future KW - Power KW - Research KW - Streams KW - Bridge Scour KW - Erodibility KW - Stream Power KW - Energy Dissipation KW - Erodibility Index LA - English PB - Colorado. Department of Transportation PY - 1994 SN - CDOT-R-SD-94-14 TI - Preliminary Procedure to Predict Scour in Bedrock M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93740 ER -
Short-Term Aging of Hot Mix Asphalt

Aschenbrener, Timothy B. ;

Far, Nava

1994-12-01 | PDF

Short-term aging is defined as the hardening or stiffening of the asphalt cement as well as the asphalt cement absorption into the aggregate as a result of the construction process. The asphalt cement ages during construction when the hot mix asphalt (HMA) is at elevated temperatures. This occurs during mixing, storage, hauling, placing, and compac ...

10/05/2026

Title : Short-Term Aging of Hot Mix Asphalt Creator(s) : Aschenbrener, Timothy B.;Far, Nava; Corporate Creator(s) : Colorado. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 1994-12-01 Report Number : CDOT-DTD-R-94-11 URL : https://rosap.ntl.bts.gov/view/dot/93739
Aschenbrener, T. B., & Far, N. (1994). Short-Term Aging of Hot Mix Asphalt (Report No. CDOT-DTD-R-94-11). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93739

Aschenbrener, Timothy B. and Nava Far. Short-Term Aging of Hot Mix Asphalt. Report no. CDOT-DTD-R-94-11. Colorado. Department of Transportation, 1994. https://rosap.ntl.bts.gov/view/dot/93739.

Aschenbrener, Timothy B., and Nava Far Short-Term Aging of Hot Mix Asphalt. Colorado. Department of Transportation, 1994, Report no. CDOT-DTD-R-94-11, ROSA P. https://rosap.ntl.bts.gov/view/dot/93739.
Export RIS Citation Information. TY - Tech Report AU - Aschenbrener, Timothy B. AU - Far, Nava A2 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - Short-term aging is defined as the hardening or stiffening of the asphalt cement as well as the asphalt cement absorption into the aggregate as a result of the construction process. The asphalt cement ages during construction when the hot mix asphalt (HMA) is at elevated temperatures. This occurs during mixing, storage, hauling, placing, and compaction operations. The purpose of this study was to investigate the length of time to short-term age samples mixed in the laboratory in order to simulate the short-term aging that is received in the field. This was done by: 1) measuring the amount of time the HMA stays at elevated temperatures in the field, 2) comparing the quantity of asphalt absorption into the aggregate between field produced and laboratory mixed samples, and 3) comparing test results from the Hamburg wheel-tracking device between field produced and laboratory mixed samples. A previous study has shown the Hamburg wheel-tracking device is very sensitive to short-term aging. Information gathered from the field indicated that the HMA stayed at elevated temperatures for approximately 1 to 2 hours for a majority of projects. Based on test results from asphalt absorption, the short-term aging time should be 2 to 4 hours; based on test results from the Hamburg wheel-tracking device, the short-term aging should be between 1 and 3 hours. As expected, the length of short-term aging in the field is quite variable because of the variable field conditions and material properties. It was recommended to short-term age samples mixed in the laboratory for 2 hours to simulate the field aging. AN - dot:93739 DA - 1994-12-01 ET - Final Report KW - Hot mix asphalt KW - Tracking systems KW - Absorption KW - Alternatives analysis KW - Field studies KW - Laboratory tests KW - Time duration KW - Asphalt cement KW - short-term aging KW - asphalt absorption KW - Hamburg wheel-tracking device LA - English PB - Colorado. Department of Transportation PY - 1994 SN - CDOT-DTD-R-94-11 TI - Short-Term Aging of Hot Mix Asphalt M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93739 ER -
Discrete Address Beacon System (DABS)/Air Traffic Control Radar Beacon System (ATCRBS) Electromagnetic Compatibility Studies

Wapelhorst, Leo ;

Hazelwood, Carl

1981-09-01 | PDF

This report describes the test procedures and results of the Discrete Address Beacon System (DABS) and Air Traffic Control Radar Beacon System (ATCRBS) compatibility studies performed at the Federal Aviation Administration (FAA) Technical Center. Four terminal ATCRBS processors: Automated Radar Terminal System (ARTS III), ARTS IIIA Sensor Receiver ...

10/05/2026

Title : Discrete Address Beacon System (DABS)/Air Traffic Control Radar Beacon System (ATCRBS) Electromagnetic Compatibility Studies Creator(s) : Wapelhorst, Leo;Hazelwood, Carl;Pagano, Thomas; Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration. Technical Center Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration Published Date : 1981-09-01 Report Number : FAA-RD-8l-l8 URL : https://rosap.ntl.bts.gov/view/dot/93738
Wapelhorst, L., Hazelwood, C., & Pagano, T. (1981). Discrete Address Beacon System (DABS)/Air Traffic Control Radar Beacon System (ATCRBS) Electromagnetic Compatibility Studies (Report No. FAA-RD-8l-l8). United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. https://rosap.ntl.bts.gov/view/dot/93738

Wapelhorst, Leo, Carl Hazelwood, and Thomas Pagano. Discrete Address Beacon System (DABS)/Air Traffic Control Radar Beacon System (ATCRBS) Electromagnetic Compatibility Studies. Report no. FAA-RD-8l-l8. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1981. https://rosap.ntl.bts.gov/view/dot/93738.

Wapelhorst, Leo, et al. Discrete Address Beacon System (DABS)/Air Traffic Control Radar Beacon System (ATCRBS) Electromagnetic Compatibility Studies. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1981, Report no. FAA-RD-8l-l8, ROSA P. https://rosap.ntl.bts.gov/view/dot/93738.
Export RIS Citation Information. TY - Tech Report AU - Wapelhorst, Leo AU - Hazelwood, Carl AU - Pagano, Thomas A2 - United States. Department of Transportation. Federal Aviation Administration. Technical Center A3 - United States. Department of Transportation. Federal Aviation Administration AB - This report describes the test procedures and results of the Discrete Address Beacon System (DABS) and Air Traffic Control Radar Beacon System (ATCRBS) compatibility studies performed at the Federal Aviation Administration (FAA) Technical Center. Four terminal ATCRBS processors: Automated Radar Terminal System (ARTS III), ARTS IIIA Sensor Receiver and Processor (SRAP), ARTS II, an AN/TPX-42, and the en route common digitizer were subjected to various anticipated DABS/ATCRBS asynchronous reply (fruit) environments. Maximum expected DABS fruit rates will not degrade performance of facilities using defruited video. The common digitizer, which does not employ a defruiter, performed with no significant degradation in the various DABS fruit environments. The SRAP, which is planned to be implemented in terminal facilities to replace the existing ARTS III Beacon Data Acquisition Subsystem (BDAS), will experience overloading of reply and report buffers by the addition of DABS fruit if a defruiter is not used. A defruiter eliminates the overload conditions to the expected maximum DABS fruit rate but adversely affects the SRAP performance. AN - dot:93738 DA - 1981-09-01 ET - Final Report KW - Radar beacons KW - Air traffic control KW - Air traffic control radar beacon system KW - Electromagnetic compatibility LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1981 SN - FAA-RD-8l-l8 TI - Discrete Address Beacon System (DABS)/Air Traffic Control Radar Beacon System (ATCRBS) Electromagnetic Compatibility Studies M3 - Tech Report N1 - United States N1 - D34-241-620 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93738 ER -
Dynamic Traffic Modelling of the 1-25/HOV Corridor

Janson, Bruce ;

Robles, Juan

1995-01-01 | PDF

This report describes a test implementation of DYMOD (a dynamic traffic assignment model) as means of predicting time-varying traffic conditions in a moderate size urban network during congested periods and incidents. The study demonstrates how one component of a future traffic management center (i.e., the dynamic traffic model) can be implemented ...

10/05/2026

Title : Dynamic Traffic Modelling of the 1-25/HOV Corridor Creator(s) : Janson, Bruce;Robles, Juan; Corporate Creator(s) : University of Colorado at Denver Corporate Contributor(s) : Colorado. Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 1995-01-01 Report Number : CTI-UCD-95-11 URL : https://rosap.ntl.bts.gov/view/dot/93737
Janson, B., & Robles, J. (1995). Dynamic Traffic Modelling of the 1-25/HOV Corridor (Report No. CTI-UCD-95-11). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93737

Janson, Bruce and Juan Robles. Dynamic Traffic Modelling of the 1-25/HOV Corridor. Report no. CTI-UCD-95-11. Colorado. Department of Transportation, 1995. https://rosap.ntl.bts.gov/view/dot/93737.

Janson, Bruce, and Juan Robles Dynamic Traffic Modelling of the 1-25/HOV Corridor. Colorado. Department of Transportation, 1995, Report no. CTI-UCD-95-11, ROSA P. https://rosap.ntl.bts.gov/view/dot/93737.
Export RIS Citation Information. TY - Tech Report AU - Janson, Bruce AU - Robles, Juan A2 - University of Colorado at Denver A3 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - This report describes a test implementation of DYMOD (a dynamic traffic assignment model) as means of predicting time-varying traffic conditions in a moderate size urban network during congested periods and incidents. The study demonstrates how one component of a future traffic management center (i.e., the dynamic traffic model) can be implemented and operated at a TMC to support traveler information systems and traffic management advisories. Based on nonlinear optimization formulations and solution algorithms, this modelling approach had already performed well in computational tests on small networks. Thus, DYMOD was ready for validation and testing on a suitable freeway /arterial system. The 1-25/HOV corridor southeast of Denver presented an excellent test environment for this application because of its (1) density of instrumentation, (2) rich diversity of highway types, and (3) dramatic variations in daily traffic conditions. AN - dot:93737 DA - 1995-01-01 ET - Final Report KW - Advanced traffic management systems KW - High occupancy vehicle lanes KW - Transportation corridors KW - Advanced traveler information systems KW - Freeways LA - English PB - Colorado. Department of Transportation PY - 1995 SN - CTI-UCD-95-11 TI - Dynamic Traffic Modelling of the 1-25/HOV Corridor M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93737 ER -
Reference Energy Mean Emission Levels Used in STAMINA 2.0 for Highway Noise Prediction in the State of Colorado

Cohn, Louis F.

1995-02-01 | PDF

This report documents the test done on noise emission levels found on vehicles in Colorado. It justifies modifications of the STAMINA 2.0 traffic noise prediction model for use in Colorado. Vehicle noise emission measurements were made in accordance with FHWA Report No. DP-45-1R. It was determined that STAMINA 2.0 (with FHWA default emission rates) ...

10/05/2026

Title : Reference Energy Mean Emission Levels Used in STAMINA 2.0 for Highway Noise Prediction in the State of Colorado Creator(s) : Cohn, Louis F. Corporate Creator(s) : Colorado. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 1995-02-01 Report Number : CDOT-R-TG-95-6 URL : https://rosap.ntl.bts.gov/view/dot/93736
Cohn, L. F. (1995). Reference Energy Mean Emission Levels Used in STAMINA 2.0 for Highway Noise Prediction in the State of Colorado (Report No. CDOT-R-TG-95-6). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93736

Cohn, Louis F.. Reference Energy Mean Emission Levels Used in STAMINA 2.0 for Highway Noise Prediction in the State of Colorado. Report no. CDOT-R-TG-95-6. Colorado. Department of Transportation, 1995. https://rosap.ntl.bts.gov/view/dot/93736.

Cohn, Louis F. Reference Energy Mean Emission Levels Used in STAMINA 2.0 for Highway Noise Prediction in the State of Colorado. Colorado. Department of Transportation, 1995, Report no. CDOT-R-TG-95-6, ROSA P. https://rosap.ntl.bts.gov/view/dot/93736.
Export RIS Citation Information. TY - Tech Report AU - Cohn, Louis F. A2 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - This report documents the test done on noise emission levels found on vehicles in Colorado. It justifies modifications of the STAMINA 2.0 traffic noise prediction model for use in Colorado. Vehicle noise emission measurements were made in accordance with FHWA Report No. DP-45-1R. It was determined that STAMINA 2.0 (with FHWA default emission rates) over predicts the noise levels by approximately 4 dBA and that adjustments to the emission rates in the model should be made. AN - dot:93736 DA - 1995-02-01 ET - Final Report: 9/93 to 1/94 KW - Adjustment factors KW - Computer models KW - Cost control KW - Forecasting KW - Motor vehicles KW - Noise barriers KW - Sound level KW - Traffic noise LA - English PB - Colorado. Department of Transportation PY - 1995 SN - CDOT-R-TG-95-6 TI - Reference Energy Mean Emission Levels Used in STAMINA 2.0 for Highway Noise Prediction in the State of Colorado M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93736 ER -
Investigation of Low Temperature Thermal Cracking in Hot Mix Asphalt

Aschenbrener, Timothy B.

1995-02-01 | PDF

A study was performed to determine the influence of material properties on the thermal cracking performance of hot mix asphalt (HMA), and to determine the ability to predict thermal cracking from pavements of known field performance. The testing device used to measure the HMA properties was the thermal-stress, restrained-specimen test (TSRST), and ...

10/05/2026

Title : Investigation of Low Temperature Thermal Cracking in Hot Mix Asphalt Creator(s) : Aschenbrener, Timothy B. Corporate Creator(s) : Colorado. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 1995-02-01 Report Number : CDOT-DTD-R-95-7 URL : https://rosap.ntl.bts.gov/view/dot/93735
Aschenbrener, T. B. (1995). Investigation of Low Temperature Thermal Cracking in Hot Mix Asphalt (Report No. CDOT-DTD-R-95-7). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93735

Aschenbrener, Timothy B.. Investigation of Low Temperature Thermal Cracking in Hot Mix Asphalt. Report no. CDOT-DTD-R-95-7. Colorado. Department of Transportation, 1995. https://rosap.ntl.bts.gov/view/dot/93735.

Aschenbrener, Timothy B. Investigation of Low Temperature Thermal Cracking in Hot Mix Asphalt. Colorado. Department of Transportation, 1995, Report no. CDOT-DTD-R-95-7, ROSA P. https://rosap.ntl.bts.gov/view/dot/93735.
Export RIS Citation Information. TY - Tech Report AU - Aschenbrener, Timothy B. A2 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - A study was performed to determine the influence of material properties on the thermal cracking performance of hot mix asphalt (HMA), and to determine the ability to predict thermal cracking from pavements of known field performance. The testing device used to measure the HMA properties was the thermal-stress, restrained-specimen test (TSRST), and the device used to measure the binder properties was the bending beam rheometer (BBR). The laboratory study was conducted to determine the variability of test results as an influence of 1) asphalt cement stiffness, 2) asphalt cement quantity, 3) mixes with various aggregate qualities, 4) aging, and 5) the presence of hydrated lime. The influence of the asphalt cement stiffness was the single largest factor that controlled the test results. The field study was performed with 9 sites of known thermal cracking performance. Correlation of the test results to the known field performance was not very good. The best correlation was with the fracture strength measured by the TSRST and the m-value from the BBR. For samples prepared and aged in the laboratory, the BBR results on the binder gave approximately 2 deg C warmer temperatures than the TSRST results on the mix. For field samples, the BBR results on the binder gave approximately 2 deg C cooler temperatures than the TSRST results on the mix. AN - dot:93735 DA - 1995-02-01 ET - Final Report KW - Thermal degradation KW - Field tests KW - Stiffness KW - Thermal stresses KW - Low temperature KW - Correlation analysis KW - Cracking KW - Fracture properties KW - Hot mix asphalt KW - Laboratory tests KW - Performance KW - Properties of materials KW - Rheometers KW - field performance KW - asphalt stiffness KW - Thermal-Stress KW - Restrained-Specimen Test (TSRST) KW - low temperature thermal cracking LA - English PB - Colorado. Department of Transportation PY - 1995 SN - CDOT-DTD-R-95-7 TI - Investigation of Low Temperature Thermal Cracking in Hot Mix Asphalt M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93735 ER -
PCCP Texturing Methods Project IR (CX) 070 - 4 (153)

Ardani, Ahmad ;

Outcalt, William (Skip)

1995-02-01 | PDF

This report describes the testing, and construction details of nine test sections with varying textural characteristics. The impacts of various surface textures (sawed vs. tined, longitudinal vs. transverse, and random vs. uniform spacing) on the frictional and noise characteristics of pavement surface were examined. Skid numbers were acquired acco ...

10/05/2026

Title : PCCP Texturing Methods Project IR (CX) 070 - 4 (153) Creator(s) : Ardani, Ahmad;Outcalt, William (Skip); Corporate Creator(s) : Colorado. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 1995-02-01 Report Number : CDOT-DTD-R-95-2 URL : https://rosap.ntl.bts.gov/view/dot/93734
Ardani, A., & Outcalt, W. (. (1995). PCCP Texturing Methods Project IR (CX) 070 - 4 (153) (Report No. CDOT-DTD-R-95-2). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93734

Ardani, Ahmad and William (Skip) Outcalt. PCCP Texturing Methods Project IR (CX) 070 - 4 (153). Report no. CDOT-DTD-R-95-2. Colorado. Department of Transportation, 1995. https://rosap.ntl.bts.gov/view/dot/93734.

Ardani, Ahmad, and William (Skip) Outcalt PCCP Texturing Methods Project IR (CX) 070 - 4 (153). Colorado. Department of Transportation, 1995, Report no. CDOT-DTD-R-95-2, ROSA P. https://rosap.ntl.bts.gov/view/dot/93734.
Export RIS Citation Information. TY - Tech Report AU - Ardani, Ahmad AU - Outcalt, William (Skip) A2 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - This report describes the testing, and construction details of nine test sections with varying textural characteristics. The impacts of various surface textures (sawed vs. tined, longitudinal vs. transverse, and random vs. uniform spacing) on the frictional and noise characteristics of pavement surface were examined. Skid numbers were acquired according to ASTM E 274 procedure with ribbed-and smooth.-tire (ASTM E 501, and 524) at 40, 50, and 65 mph for all the test sections. Six different types of texture measuring devices were used to measure and compare the amount of texture in each of the test sections. To examine the noise properties of the test sections, noise data were acquired in three different locations: inside of the test vehicle, 25 feet from the center line, and near the right rear tire of the test vehicle away from the exhaust pipe. AN - dot:93734 DA - 1995-02-01 ET - Interim Report KW - Surface texture tests KW - Concrete pavements KW - Construction equipment KW - Data collection KW - Friction tests KW - Measuring instruments KW - Noise KW - Pavement surface course KW - Skid resistance tests KW - Texture KW - Test sections KW - skid number KW - ribbed smooth-tire KW - noise level LA - English PB - Colorado. Department of Transportation PY - 1995 SN - CDOT-DTD-R-95-2 TI - PCCP Texturing Methods Project IR (CX) 070 - 4 (153) M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93734 ER -
Keyway Curb Construction Report

Outcalt, William (Skip)

1995-02-01 | PDF

This report describes the procedures, problems, and costs of installation of a keyway type curb. Cost effectiveness of keyway curbs will be evaluated during this study by tracking the performance, durability, and cost of maintaining a section of curb that was installed on US, 24 in Colorado Springs.

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Title : Keyway Curb Construction Report Creator(s) : Outcalt, William (Skip) Corporate Creator(s) : Colorado. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 1995-02-01 Report Number : CDOT-DID-R-95-3;File 96.00 1571P; URL : https://rosap.ntl.bts.gov/view/dot/93733
Outcalt, W. (. (1995). Keyway Curb Construction Report (Report No. CDOT-DID-R-95-3). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93733

Outcalt, William (Skip). Keyway Curb Construction Report. Report no. CDOT-DID-R-95-3. Colorado. Department of Transportation, 1995. https://rosap.ntl.bts.gov/view/dot/93733.

Outcalt, William (Skip) Keyway Curb Construction Report. Colorado. Department of Transportation, 1995, Report no. CDOT-DID-R-95-3, ROSA P. https://rosap.ntl.bts.gov/view/dot/93733.
Export RIS Citation Information. TY - Tech Report AU - Outcalt, William (Skip) A2 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - This report describes the procedures, problems, and costs of installation of a keyway type curb. Cost effectiveness of keyway curbs will be evaluated during this study by tracking the performance, durability, and cost of maintaining a section of curb that was installed on US, 24 in Colorado Springs. AN - dot:93733 DA - 1995-02-01 KW - Curbs KW - Concrete KW - Construction management KW - Cost effectiveness KW - Costs KW - Durability KW - Performance KW - Slip form paving LA - English PB - Colorado. Department of Transportation PY - 1995 SN - CDOT-DID-R-95-3 TI - Keyway Curb Construction Report M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93733 ER -
Environmentally Sensitive Sanding and Deicing Practices

Chang, Nien-Yin ;

Pearson, Walter H.

1995-03-01 | PDF

Growth in the Denver-metro area has led to an increased impact on the environment due to winter maintenance activities. According to the Regional Air Quality Council, the use of sand as a traction aid contributes up to 45 % of the particulate air pollution (PM10) in the Denver area. The Environmentally Sensitive Sanding and Deicing Practices at the ...

10/05/2026

Title : Environmentally Sensitive Sanding and Deicing Practices Creator(s) : Chang, Nien-Yin;Pearson, Walter H.;Chang, James L. J.;Gross, A. J;Meyer, Mark;Jolly, Marva;Yang, Barbara;Samour, Hellen; Corporate Creator(s) : University of Colorado at Denver. Department of Civil Engineering;Colorado Transportation Institute; Corporate Contributor(s) : Colorado. Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 1995-03-01 Report Number : CDOT-CTI-95-5 URL : https://rosap.ntl.bts.gov/view/dot/93732
Chang, N. Y., Pearson, W. H., Chang, J. L. J., Gross, A. J., Meyer, M., Jolly, M., Yang, B., & Samour, H. (1995). Environmentally Sensitive Sanding and Deicing Practices (Report No. CDOT-CTI-95-5). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93732

Chang, Nien-Yin, Walter H. Pearson, James L. J. Chang, A. J Gross, Mark Meyer, Marva Jolly, Barbara Yang, and Hellen Samour. Environmentally Sensitive Sanding and Deicing Practices. Report no. CDOT-CTI-95-5. Colorado. Department of Transportation, 1995. https://rosap.ntl.bts.gov/view/dot/93732.

Chang, Nien-Yin, et al. Environmentally Sensitive Sanding and Deicing Practices. Colorado. Department of Transportation, 1995, Report no. CDOT-CTI-95-5, ROSA P. https://rosap.ntl.bts.gov/view/dot/93732.
Export RIS Citation Information. TY - Tech Report AU - Chang, Nien-Yin AU - Pearson, Walter H. AU - Chang, James L. J. AU - Gross, A. J AU - Meyer, Mark AU - Jolly, Marva AU - Yang, Barbara AU - Samour, Hellen A2 - University of Colorado at Denver. Department of Civil Engineering A2 - Colorado Transportation Institute A3 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - Growth in the Denver-metro area has led to an increased impact on the environment due to winter maintenance activities. According to the Regional Air Quality Council, the use of sand as a traction aid contributes up to 45 % of the particulate air pollution (PM10) in the Denver area. The Environmentally Sensitive Sanding and Deicing Practices at the University of Colorado at Denver investigated literature and current practices from a wide variety of sources to arrive at a document which summarizes the current state of knowledge about deicing practices and their effect on human health and the environment. Topics include, properties of snow and ice, roadway traction, anti-skid materials, air quality impacts of anti-skid materials, water quality impacts of deicing chemicals, deicing chemicals, equipment to apply deicers, snow and ice management practices, and current practices obtained from interviews and site visits. Topics for further research are also discussed. AN - dot:93732 DA - 1995-03-01 ET - Final Report: 9/93 to 12/94 KW - Deicing chemicals KW - Snow and ice control KW - Salts KW - Water quality KW - Air quality KW - Environmental impacts KW - Literature reviews LA - English PB - Colorado. Department of Transportation PY - 1995 SN - CDOT-CTI-95-5 TI - Environmentally Sensitive Sanding and Deicing Practices M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93732 ER -
Visual Guidance Automation - Technology Assessment Report

Bagot, Keith

1995-04-01 | PDF

This report provides an assessment of current devices and technologies which may be applicable to the navigation and control of aircraft and service support vehicles on the airport surface traffic management area. The areas investigated included object sensing systems, object location and detection systems, visual aids, communication and control sy ...

10/05/2026

Title : Visual Guidance Automation - Technology Assessment Report Creator(s) : Bagot, Keith Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration. Technical Center Published Date : 1995-04-01 Report Number : DOT/FAA/CT-95/3 URL : https://rosap.ntl.bts.gov/view/dot/93731
Bagot, K. (1995). Visual Guidance Automation - Technology Assessment Report (Report No. DOT/FAA/CT-95/3). United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. https://rosap.ntl.bts.gov/view/dot/93731

Bagot, Keith. Visual Guidance Automation - Technology Assessment Report. Report no. DOT/FAA/CT-95/3. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1995. https://rosap.ntl.bts.gov/view/dot/93731.

Bagot, Keith Visual Guidance Automation - Technology Assessment Report. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1995, Report no. DOT/FAA/CT-95/3, ROSA P. https://rosap.ntl.bts.gov/view/dot/93731.
Export RIS Citation Information. TY - Tech Report AU - Bagot, Keith A2 - United States. Department of Transportation. Federal Aviation Administration. Technical Center AB - This report provides an assessment of current devices and technologies which may be applicable to the navigation and control of aircraft and service support vehicles on the airport surface traffic management area. The areas investigated included object sensing systems, object location and detection systems, visual aids, communication and control systems, and human factors facilities. The components, devices, or systems in each area were rated based on the maturity, applicability, compatibility, and risk as related to the FAA mission of airport surface control. A major finding of this assessment was that although there are many devices used in commercial vehicular traffic control systems and in industrial process control systems, the application of these devices to the FAA mission is restricted by the large signal range needed for object detection for airports in all types of weather and visibility conditions. AN - dot:93731 DA - 1995-04-01 ET - Final Report KW - Ground transportation KW - Air transportation KW - Air traffic control KW - Object detection KW - Detection and identification systems KW - Visual aids LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1995 SN - DOT/FAA/CT-95/3 TI - Visual Guidance Automation - Technology Assessment Report M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93731 ER -
The Siting, Installation, and Operational Suitability of the Automated Weather Observing System (AWOS) at Heliports

Matos, Rene A ;

Sacket, John R

1986-08-01 | PDF

An Automated Weather Observing System (AWOS) was installed at the Federal Aviation Administration (FAA) Technical Center's Interim Concept Development Heliport. This was done in order to evaluate the siting, installation, and operational suitability of the AWOS at a heliport. The principal recommendations of this report have been incorporated in FA ...

10/05/2026

Title : The Siting, Installation, and Operational Suitability of the Automated Weather Observing System (AWOS) at Heliports Creator(s) : Matos, Rene A;Sacket, John R;Shuster, Philip;Weiss, Rosanne M; Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration. Technical Center Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration Published Date : 1986-08-01 Report Number : DOT/FAA/PM-86-30;DOT/FAA/CT-86/9; URL : https://rosap.ntl.bts.gov/view/dot/93730
Matos, R. A., Sacket, J. R., Shuster, P., & Weiss, R. M. (1986). The Siting, Installation, and Operational Suitability of the Automated Weather Observing System (AWOS) at Heliports (Report No. DOT/FAA/PM-86-30). United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. https://rosap.ntl.bts.gov/view/dot/93730

Matos, Rene A, John R Sacket, Philip Shuster, and Rosanne M Weiss. The Siting, Installation, and Operational Suitability of the Automated Weather Observing System (AWOS) at Heliports. Report no. DOT/FAA/PM-86-30. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1986. https://rosap.ntl.bts.gov/view/dot/93730.

Matos, Rene A, et al. The Siting, Installation, and Operational Suitability of the Automated Weather Observing System (AWOS) at Heliports. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1986, Report no. DOT/FAA/PM-86-30, ROSA P. https://rosap.ntl.bts.gov/view/dot/93730.
Export RIS Citation Information. TY - Tech Report AU - Matos, Rene A AU - Sacket, John R AU - Shuster, Philip AU - Weiss, Rosanne M A2 - United States. Department of Transportation. Federal Aviation Administration. Technical Center A3 - United States. Department of Transportation. Federal Aviation Administration AB - An Automated Weather Observing System (AWOS) was installed at the Federal Aviation Administration (FAA) Technical Center's Interim Concept Development Heliport. This was done in order to evaluate the siting, installation, and operational suitability of the AWOS at a heliport. The principal recommendations of this report have been incorporated in FAA Advisory Circular (AC) 150/5220-16, Automated Weather Observing Systems (AWOS) for Non-Federal applications. AN - dot:93730 DA - 1986-08-01 ET - Final Report KW - Aeronautics KW - Heliports KW - Meteorology KW - Weather forecasting LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1986 SN - DOT/FAA/PM-86-30 TI - The Siting, Installation, and Operational Suitability of the Automated Weather Observing System (AWOS) at Heliports M3 - Tech Report N1 - United States N1 - T0705A DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93730 ER -
Biodynamics Response for the Evaluation of Aircraft Crash Safety

Lankarani, Hamid M.

1993-09-01 | PDF

A comprehensive study of the capabilities of the program SOM-LA/TA (Seat Occupant Model -Light Aircraft/Transport Aircraft) has been performed and deficiencies of its occupant models have been identified. For the prediction of occupant head injuries, formulations and mechanisms of head injury have been evaluated. Head-Injury-Criteria (HIC) from ana ...

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Title : Biodynamics Response for the Evaluation of Aircraft Crash Safety Creator(s) : Lankarani, Hamid M. Corporate Creator(s) : National Institute for Aviation Research (U.S.);Wichita State University; Published Date : 1993-09-01 Report Number : DOT/FAA/CT-03-90-C-00044 URL : https://rosap.ntl.bts.gov/view/dot/93729
Lankarani, H. M. (1993). Biodynamics Response for the Evaluation of Aircraft Crash Safety (Report No. DOT/FAA/CT-03-90-C-00044). United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. https://rosap.ntl.bts.gov/view/dot/93729

Lankarani, Hamid M.. Biodynamics Response for the Evaluation of Aircraft Crash Safety. Report no. DOT/FAA/CT-03-90-C-00044. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1993. https://rosap.ntl.bts.gov/view/dot/93729.

Lankarani, Hamid M. Biodynamics Response for the Evaluation of Aircraft Crash Safety. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1993, Report no. DOT/FAA/CT-03-90-C-00044, ROSA P. https://rosap.ntl.bts.gov/view/dot/93729.
Export RIS Citation Information. TY - Tech Report AU - Lankarani, Hamid M. A2 - National Institute for Aviation Research (U.S.) A2 - Wichita State University AB - A comprehensive study of the capabilities of the program SOM-LA/TA (Seat Occupant Model -Light Aircraft/Transport Aircraft) has been performed and deficiencies of its occupant models have been identified. For the prediction of occupant head injuries, formulations and mechanisms of head injury have been evaluated. Head-Injury-Criteria (HIC) from analysis codes and experiments have been computed and compared. Feasibility and detailed designs of a simple non-sled HIC-measuring test mechanism have been accomplished and issues regarding the construction of test facility has been discussed. AN - dot:93729 DA - 1993-09-01 KW - Biodynamics KW - Crash injury research KW - Aircraft crash victims LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1993 SN - DOT/FAA/CT-03-90-C-00044 TI - Biodynamics Response for the Evaluation of Aircraft Crash Safety M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93729 ER -
A Study of Intermediate Geomaterials and Highly Erodible Rock [Technical Summary]

Kulesza, Stacey E. ;

Chavez, Wilson F. Espinoza

2026-09-01 | PDF

The primary objective of this research was to measure the erosion potential of Kansas shales at the surface and near the surface at a relatively shallow depth (2-3 ft). Considering the relationship between shale porosity and erodibility, this research also investigated the role of freeze-thaw cycles on shale porosity to predict a timeline of increa ...

10/05/2026

Title : A Study of Intermediate Geomaterials and Highly Erodible Rock [Technical Summary] Creator(s) : Kulesza, Stacey E.;Chavez, Wilson F. Espinoza;Barman, Konica;Castillo, Rodolfo; Corporate Creator(s) : Texas State University--San Marcos Corporate Contributor(s) : Texas Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Contributor(s) : Hutchinson, Stacy Published Date : 2026-09-01 Report Number : K-TRAN: KSU-22-8 URL : https://rosap.ntl.bts.gov/view/dot/93728
Kulesza, S. E., Chavez, W. F. E., Barman, K., & Castillo, R. (2026). A Study of Intermediate Geomaterials and Highly Erodible Rock [Technical Summary] (Report No. K-TRAN: KSU-22-8). Kansas. Department of Transportation. Bureau of Materials and Research. https://rosap.ntl.bts.gov/view/dot/93728

Kulesza, Stacey E., Wilson F. Espinoza Chavez, Konica Barman, and Rodolfo Castillo. A Study of Intermediate Geomaterials and Highly Erodible Rock [Technical Summary]. Report no. K-TRAN: KSU-22-8. Kansas. Department of Transportation. Bureau of Materials and Research, 2026. https://rosap.ntl.bts.gov/view/dot/93728.

Kulesza, Stacey E., et al. A Study of Intermediate Geomaterials and Highly Erodible Rock [Technical Summary]. Kansas. Department of Transportation. Bureau of Materials and Research, 2026, Report no. K-TRAN: KSU-22-8, ROSA P. https://rosap.ntl.bts.gov/view/dot/93728.
Export RIS Citation Information. TY - Brief AU - Kulesza, Stacey E. AU - Chavez, Wilson F. Espinoza AU - Barman, Konica AU - Castillo, Rodolfo A2 - Texas State University--San Marcos A3 - Texas Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - The primary objective of this research was to measure the erosion potential of Kansas shales at the surface and near the surface at a relatively shallow depth (2-3 ft). Considering the relationship between shale porosity and erodibility, this research also investigated the role of freeze-thaw cycles on shale porosity to predict a timeline of increasing shale erodibility by observing the influence of ambient air freeze-thaw cycles on porosity and pore structure change in shale. Understanding the factors that influence shale erosion is essential for effective asset management and implementation of best practices to prevent or minimize shale erosion. Additional research could result in more comprehensive knowledge of how freeze-thaw cycles and changes in pore structure interact and contribute to shale erosion, leading to more effective preventive measures. A brief literature review of shale erosion and relevant measurements to this research follows this introduction. A detailed methods section covers all standard and newly developed approaches to meet the objectives of this study, and the results and discussion sections offer insights into the findings. The report ends with conclusions and recommendations for implementation. AN - dot:93728 DA - 2026-09-01 ET - Technical Summary KW - Shale KW - Erosion KW - Porosity KW - Geomaterials KW - Slopes KW - Permeability coefficient KW - Environmental protection KW - Decision making LA - English PB - Kansas. Department of Transportation. Bureau of Materials and Research PY - 2026 SN - K-TRAN: KSU-22-8 TI - A Study of Intermediate Geomaterials and Highly Erodible Rock [Technical Summary] M3 - Brief N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93728 ER -
A Study of Intermediate Geomaterials and Highly Erodible Rock

Kulesza, Stacey E. ;

Chavez, Wilson F. Espinoza

2026-09-01 | PDF

Although substantial research on soil erodibility has recently been conducted at the federal (e.g., NCHRP 915) and state (e.g., K-TRAN: KSU-15-4; K-TRAN: KSU-18-5) levels, information regarding erosion characteristics of rock or intermediate geomaterials, such as shale, is extremely limited. Shale exposure on cut slopes or natural slopes leads to p ...

10/05/2026

Title : A Study of Intermediate Geomaterials and Highly Erodible Rock Creator(s) : Kulesza, Stacey E.;Chavez, Wilson F. Espinoza;Barman, Konica;Castillo, Rodolfo; Corporate Creator(s) : Kansas State University Transportation Center. Department of Civil Engineering;Texas State University--San Marcos; Corporate Contributor(s) : Texas Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 2026-09-01 Report Number : K-TRAN: KSU-22-8 URL : https://rosap.ntl.bts.gov/view/dot/93727
Kulesza, S. E., Chavez, W. F. E., Barman, K., & Castillo, R. (2026). A Study of Intermediate Geomaterials and Highly Erodible Rock (Report No. K-TRAN: KSU-22-8). Kansas. Department of Transportation. Bureau of Materials and Research. https://rosap.ntl.bts.gov/view/dot/93727

Kulesza, Stacey E., Wilson F. Espinoza Chavez, Konica Barman, and Rodolfo Castillo. A Study of Intermediate Geomaterials and Highly Erodible Rock. Report no. K-TRAN: KSU-22-8. Kansas. Department of Transportation. Bureau of Materials and Research, 2026. https://rosap.ntl.bts.gov/view/dot/93727.

Kulesza, Stacey E., et al. A Study of Intermediate Geomaterials and Highly Erodible Rock. Kansas. Department of Transportation. Bureau of Materials and Research, 2026, Report no. K-TRAN: KSU-22-8, ROSA P. https://rosap.ntl.bts.gov/view/dot/93727.
Export RIS Citation Information. TY - Tech Report AU - Kulesza, Stacey E. AU - Chavez, Wilson F. Espinoza AU - Barman, Konica AU - Castillo, Rodolfo A2 - Kansas State University Transportation Center. Department of Civil Engineering A2 - Texas State University--San Marcos A3 - Texas Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - Although substantial research on soil erodibility has recently been conducted at the federal (e.g., NCHRP 915) and state (e.g., K-TRAN: KSU-15-4; K-TRAN: KSU-18-5) levels, information regarding erosion characteristics of rock or intermediate geomaterials, such as shale, is extremely limited. Shale exposure on cut slopes or natural slopes leads to potential erosion. The objective of this research was to measure the erodibility of Kansas shales, specifically loose, weathered material collected from the surface of cut slopes and the denser, intact specimens below. Because erosion characteristics differ significantly, this study also developed a simple method to predict the time over which shale transitions from not erodible to highly erodible. Samples were collected from five sites that had exposed shale on a cut slope, and the loose material at the top of a Shelby tube was reconstituted for erosion testing and constant head testing to determine hydraulic conductivity. The dense, intact material was tested in the Shelby tube without extrusion for erosion testing and hydraulic conductivity via the falling head permeability test. Falling head tests were performed before and after exposure to controlled freeze-thaw conditions to evaluate changes in permeability and subsequent porosity under Kansas-like environmental conditions-key indicators of erosion potential in shale. An empirical model was also developed to predict the number of freeze-thaw cycles needed for non-erodible intact shales to transform into highly erodible weathered material. The Kansas Department of Transportation could use this thorough analysis to improve decision-making and effective erosion mitigation strategies in similar geological settings. Results of this study also enhance understanding of shale erosion processes, with practical implications for infrastructure safety and environmental protection. AN - dot:93727 DA - 2026-09-01 ET - Final Report: July 2021 - December 2023 KW - Shale KW - Erosion KW - Porosity KW - Geomaterials KW - Slopes KW - Permeability coefficient KW - Environmental protection KW - Decision making LA - English PB - Kansas. Department of Transportation. Bureau of Materials and Research PY - 2026 SN - K-TRAN: KSU-22-8 TI - A Study of Intermediate Geomaterials and Highly Erodible Rock M3 - Tech Report N1 - United States N1 - C2188 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93727 ER -

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