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Showing 421 - 425 of 425 results

Yellow and Red Intervals to Improve Signal Timing Plans for Left-Turn Movements

Yu, Lei ;

Qiao, Fengxiang

2002-08-01 | PDF

This project intends to develop and test a framework for setting yellow change and red clearance intervals for the left-turn movement, which can be used directly by the field traffic engineers in selecting the appropriate values for parameters in the proposed framework. The framework is designed to incorporate a comprehensive set of parameters rela ...

11/17/2025

Title : Yellow and Red Intervals to Improve Signal Timing Plans for Left-Turn Movements Creator(s) : Yu, Lei;Qiao, Fengxiang;Zhang, Yusong;Tian, Zong Z;Chaudhary, Nadeem; Corporate Creator(s) : Texas Southern University. Dept. of Transportation Studies Corporate Contributor(s) : Texas Department of Transportation. Research and Technology Implementation Office;United States. Department of Transportation. Federal Highway Administration; Published Date : 2002-08-01 Report Number : TX-02/4273-1 URL : https://rosap.ntl.bts.gov/view/dot/87718 Yu, Lei et al. (2002). Yellow and Red Intervals to Improve Signal Timing Plans for Left-Turn Movements. Yu, Lei et al. "Yellow and Red Intervals to Improve Signal Timing Plans for Left-Turn Movements" (2002) Yu, Lei et al. "Yellow and Red Intervals to Improve Signal Timing Plans for Left-Turn Movements" , 2002 Export RIS Citation Information. TY - Tech Report AU - Yu, Lei AU - Qiao, Fengxiang AU - Zhang, Yusong AU - Tian, Zong Z AU - Chaudhary, Nadeem A2 - Texas Southern University. Dept. of Transportation Studies A3 - Texas Department of Transportation. Research and Technology Implementation Office A3 - United States. Department of Transportation. Federal Highway Administration AB - This project intends to develop and test a framework for setting yellow change and red clearance intervals for the left-turn movement, which can be used directly by the field traffic engineers in selecting the appropriate values for parameters in the proposed framework. The framework is designed to incorporate a comprehensive set of parameters related to intersection geometry, perception, human comfort, driver's behavior, safety issues, and traffic related laws. The application of this proposed framework is expected to improve both the left-turn movement safety and the efficiency at the intersection. This is the interim report for the project, which summarizes the work that has been performed during the first year (2001-2002) of this two-year project. AN - dot:87718 KW - Left turns KW - Red interval (Traffic signal cycle) KW - Traffic signal timing KW - Yellow interval (Traffic signal cycle) LA - English PB - Texas. Department of Transportation PY - 2002-08-01 SN - TX-02/4273-1 TI - Yellow and Red Intervals to Improve Signal Timing Plans for Left-Turn Movements M3 - Tech Report N1 - United States N1 - 0-4273 UR - https://rosap.ntl.bts.gov/view/dot/87718 ER -
Identification of Traffic Control Problems on Urban Arterial Work Zones

Tsyganov, Alexei ;

Machemehl, Randy

2003-09-01 | PDF

Continuous industrial development in Texas led to a significant population increase. This caused an overload of the existing highway network, especially in the major urban areas, and in turn called for necessary alterations and improvements to bring the urban transportation system up to date. Numerous improvement projects on urban arterial streets ...

11/17/2025

Title : Identification of Traffic Control Problems on Urban Arterial Work Zones Creator(s) : Tsyganov, Alexei;Machemehl, Randy;Liapi, Katherine; Corporate Creator(s) : University of Texas at Austin. Center for Transportation Research Corporate Contributor(s) : Texas Department of Transportation. Research and Technology Implementation Office;United States. Department of Transportation. Federal Highway Administration; Published Date : 2003-09-01 Report Number : FHWA/TX-04/4266-1 URL : https://rosap.ntl.bts.gov/view/dot/87717 Tsyganov, Alexei et al. (2003). Identification of Traffic Control Problems on Urban Arterial Work Zones. Tsyganov, Alexei and Machemehl, Randy and Liapi, Katherine "Identification of Traffic Control Problems on Urban Arterial Work Zones" (2003) Tsyganov, Alexei et al. "Identification of Traffic Control Problems on Urban Arterial Work Zones" , 2003 Export RIS Citation Information. TY - Tech Report AU - Tsyganov, Alexei AU - Machemehl, Randy AU - Liapi, Katherine A2 - University of Texas at Austin. Center for Transportation Research A3 - Texas Department of Transportation. Research and Technology Implementation Office A3 - United States. Department of Transportation. Federal Highway Administration AB - Continuous industrial development in Texas led to a significant population increase. This caused an overload of the existing highway network, especially in the major urban areas, and in turn called for necessary alterations and improvements to bring the urban transportation system up to date. Numerous improvement projects on urban arterial streets currently cause significant changes in traffic operation and safety. This study focuses on determining, characterizing, and effectively communicating best treatments for improvement of traffic safety on urban arterial streets during roadworks. An extended literature review regarding different impacts of work zone on traffic operation and safety suggested the most frequent types of accidents and the major contributing factors. Based on the field observations of work zones on urban arterial streets in Austin, San Antonio, and Houston metropolitan areas, and the questionnaire survey of Texas Department of Transportation personnel involved in traffic control design and inspection, existing traffic control problems were identified and classified. The researchers compared the obtained findings with current design standards and developed recommendations for improvements of urban arterial work zone traffic control plans. The developments include signing, marking, and other devices better suited to drivers' abilities and behavior. The first version of the typical traffic control plans and recommendations for improvements in the Manual on Uniform Traffic Control Devices regarding urban arterial work zones were developed. AN - dot:87717 KW - Arterial highways KW - Best practices KW - Field studies KW - Improvements KW - Literature reviews KW - Problem identification LA - English PB - Texas. Department of Transportation PY - 2003-09-01 SN - FHWA/TX-04/4266-1 TI - Identification of Traffic Control Problems on Urban Arterial Work Zones M3 - Tech Report N1 - United States N1 - 0-4266 UR - https://rosap.ntl.bts.gov/view/dot/87717 ER -
Design and Installation Guidelines for Advance Warning Systems for End-of-Green Phase at High Speed Traffic Signals

Messer, Carroll J. ;

Sunkari, Srinivasa R

2003-12-01 | PDF

This report describes the research conducted within a two-year study that developed an effective advance warning for end-of-green phase at high-speed traffic signals in Texas. High-speed signals are defined as having approach speeds of 45 mph or more. Two Advance Warning for End-of-Green Signals (AWEGSs) were designed, and the field tests showed a ...

11/17/2025

Title : Design and Installation Guidelines for Advance Warning Systems for End-of-Green Phase at High Speed Traffic Signals Creator(s) : Messer, Carroll J.;Sunkari, Srinivasa R;Charara, Hassan A.; Corporate Creator(s) : Texas Transportation Institute. Texas A&M University Corporate Contributor(s) : Texas Department of Transportation. Research and Technology Implementation Office;United States. Department of Transportation. Federal Highway Administration; Published Date : 2003-12-01 Report Number : FHWA/TX-04/0-4260-2 URL : https://rosap.ntl.bts.gov/view/dot/87716 Messer, Carroll J. et al. (2003). Design and Installation Guidelines for Advance Warning Systems for End-of-Green Phase at High Speed Traffic Signals. Messer, Carroll J. and Sunkari, Srinivasa R and Charara, Hassan A. "Design and Installation Guidelines for Advance Warning Systems for End-of-Green Phase at High Speed Traffic Signals" (2003) Messer, Carroll J. et al. "Design and Installation Guidelines for Advance Warning Systems for End-of-Green Phase at High Speed Traffic Signals" , 2003 Export RIS Citation Information. TY - Tech Report AU - Messer, Carroll J. AU - Sunkari, Srinivasa R AU - Charara, Hassan A. A2 - Texas Transportation Institute. Texas A&M University A3 - Texas Department of Transportation. Research and Technology Implementation Office A3 - United States. Department of Transportation. Federal Highway Administration AB - This report describes the research conducted within a two-year study that developed an effective advance warning for end-of-green phase at high-speed traffic signals in Texas. High-speed signals are defined as having approach speeds of 45 mph or more. Two Advance Warning for End-of-Green Signals (AWEGSs) were designed, and the field tests showed a 40-45% reduction in red-light running can be expected with well designed, constructed, and maintained systems. This report provides a manual that traffic engineers can use to design and install an AWEGS in the field to improve the safety experience with problematic traffic-actuated signalized intersections. Advance detector design and layout guidelines are provided together with sign design and deployment guidance. A set of uniformly spaced dilemma zone detectors is presumed to be in place on each high-speed approach at the existing traffic actuated signalized intersection to which the AWEGS is envisioned to be added as a safety treatment. A Microsoft Excel-based software, named AWEGS Designer, which can be used to design and layout an AWEGS is available by e-mail at c-messer@tamu.edu or online at http://ceprofs.tamu.edu/cmesser/awegs/. The software is in directory AWEGS. AN - dot:87716 KW - Design KW - Dilemma zone KW - Field tests KW - Green interval (Traffic signal cycle) KW - Loop detectors KW - Installation KW - Layout LA - English PB - Texas. Department of Transportation PY - 2003-12-01 SN - FHWA/TX-04/0-4260-2 TI - Design and Installation Guidelines for Advance Warning Systems for End-of-Green Phase at High Speed Traffic Signals M3 - Tech Report N1 - United States N1 - 0-4260 UR - https://rosap.ntl.bts.gov/view/dot/87716 ER -
Development and Delivery of Access Management Training Materials and Workshops

Frawley, William E. ;

Eisele, William L.

2008-01-01 | PDF

This report documents the development and delivery of outreach materials and workshops explaining access management principles and demonstrating related benefits.

11/17/2025

Title : Development and Delivery of Access Management Training Materials and Workshops Creator(s) : Frawley, William E.;Eisele, William L.; Corporate Creator(s) : Texas A&M University. Texas Transportation Institute Corporate Contributor(s) : Texas Department of Transportation. Research and Technology Implementation Office;United States. Department of Transportation. Federal Highway Administration; Published Date : 2008-01-01 Report Number : FHWA/TX-08/5-4221-01-1, 5-4221-01-1 URL : https://rosap.ntl.bts.gov/view/dot/87715 Frawley, William E. and Eisele, William L. (2008). Development and Delivery of Access Management Training Materials and Workshops. Frawley, William E. and Eisele, William L. "Development and Delivery of Access Management Training Materials and Workshops" (2008) Frawley, William E. and Eisele, William L. "Development and Delivery of Access Management Training Materials and Workshops" , 2008 Export RIS Citation Information. TY - Tech Report AU - Frawley, William E. AU - Eisele, William L. A2 - Texas A&M University. Texas Transportation Institute A3 - Texas Department of Transportation. Research and Technology Implementation Office A3 - United States. Department of Transportation. Federal Highway Administration AB - This report documents the development and delivery of outreach materials and workshops explaining access management principles and demonstrating related benefits. AN - dot:87715 KW - Education and training KW - Highway access management KW - Workshops LA - English PB - Texas. Department of Transportation PY - 2008-01-01 SN - FHWA/TX-08/5-4221-01-1, 5-4221-01-1 TI - Development and Delivery of Access Management Training Materials and Workshops M3 - Tech Report N1 - United States N1 - 5-4221-01 UR - https://rosap.ntl.bts.gov/view/dot/87715 ER -
Development of Biochar Specification Criteria as Soil Amendment for Slopes, Conveyances and Stormwater Treatment Systems (Phase 1)

Barry, Brian ;

Haile, Tadele

2025-07-01 | PDF

The objective of this project is to develop knowledge, tools, and protocols to inform best practice standards for effective implementation of biochar in bioretention systems (BRSs) for treating roadway runoff. This project will be performed in two phases, with the first phase (this report) focusing on biochar production, characterization, and conta ...

11/17/2025

Title : Development of Biochar Specification Criteria as Soil Amendment for Slopes, Conveyances and Stormwater Treatment Systems (Phase 1) Creator(s) : Barry, Brian;Haile, Tadele;Ulrich, Bridget;Young, Matt; Corporate Creator(s) : University of Minnesota, Duluth. Natural Resources Research Institute Corporate Contributor(s) : Minnesota. Department of Transportation. Office of Research & Innovation Published Date : 2025-07-01 Report Number : MN 2025-36 URL : https://rosap.ntl.bts.gov/view/dot/87714 Barry, Brian et al. (2025). Development of Biochar Specification Criteria as Soil Amendment for Slopes, Conveyances and Stormwater Treatment Systems (Phase 1). Barry, Brian et al. "Development of Biochar Specification Criteria as Soil Amendment for Slopes, Conveyances and Stormwater Treatment Systems (Phase 1)" (2025) Barry, Brian et al. "Development of Biochar Specification Criteria as Soil Amendment for Slopes, Conveyances and Stormwater Treatment Systems (Phase 1)" , 2025 Export RIS Citation Information. TY - Tech Report AU - Barry, Brian AU - Haile, Tadele AU - Ulrich, Bridget AU - Young, Matt A2 - University of Minnesota, Duluth. Natural Resources Research Institute A3 - Minnesota. Department of Transportation. Office of Research & Innovation AB - The objective of this project is to develop knowledge, tools, and protocols to inform best practice standards for effective implementation of biochar in bioretention systems (BRSs) for treating roadway runoff. This project will be performed in two phases, with the first phase (this report) focusing on biochar production, characterization, and contaminant sorption performance. Results from the first phase will inform decisions for the second phase which will look at vegetation growth studies and soil hydrology evaluations. The authors anticipate the primary project output (following completion of Phase 2) to be a tool or protocol (e.g., a decision-making matrix) to provide standardized guidance for best practices regarding the practical implementation of biochar in BRSs treating roadway runoff. The work plan for Phase 1 is presented herein, which will result in following outputs: 1. Recommendations for locally available, suitable biomass feedstocks and feedstock-specific pyrolysis conditions which can be reproduced at scale. 2. Biochar physical property specification criteria associated with contaminant-removal targets which can be assessed at reasonable costs. 3. Protocols for screening-level contaminant-removal performance tests based on broadly accessible materials and methods. 4. Plans for further evaluations to verify treatment performance and evaluate hydraulic and soil health effects, to be proposed as a part of Phase 2 investigations. AN - dot:87714 ET - Final Report KW - Carbon KW - Contaminants KW - Detention basins KW - Engineering soils KW - Environmental impacts KW - Runoff KW - Slopes KW - Specifications LA - English PB - Minnesota. Department of Transportation PY - 2025-07-01 SN - MN 2025-36 TI - Development of Biochar Specification Criteria as Soil Amendment for Slopes, Conveyances and Stormwater Treatment Systems (Phase 1) M3 - Tech Report N1 - United States N1 - (c)1036342 (wo)87 UR - https://rosap.ntl.bts.gov/view/dot/87714 ER -

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