Effect of Large Vehicles on Left Turn Gap Acceptance at Signalized Intersections
Driver gap acceptance behavior is a function of geometric and operational factors. An essential measure of gap acceptance is the critical gap. At signalized intersections with permissive left turn movements, the critical gap is the foundation to estimate left turn capacity. Several studies have identified geometric, temporal, spatial, and operational effects on the critical gap estimates. However, recommended critical gap values have remained unchanged for decades. The Highway Capacity Manual recommended critical gap for left turns at signalized intersections is 4.5 seconds and the follow-up headway is 2.5 seconds. Most conventional signal optimization software (PASSER, SHYCHRO, VISSIM, SIDRA, HCS) use these outdated critical gap and follow-up headway estimates without accounting for specific traffic conditions such as large vehicles affecting gap acceptance. As part of this study, observational data and gap acceptance estimates with the presence of large vehicles will be integrated with microsimulation and signal optimization software to evaluate the effect of large vehicles in operational performance of left turning vehicles at signalized intersections.
Language
- English
Project
- Status: Completed
- Funding: $ 74977
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Contract Numbers:
69A3551747131
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Sponsor Organizations:
Office of the Assistant Secretary for Research and Technology
University Transportation Centers Program
Department of Transportation
Washington, DC United States 20590 -
Managing Organizations:
University of Iowa, Iowa City
National Advanced Driving Simulator, 2401 Oakdale Blvd
Iowa City, IA United States 52242-5003 -
Performing Organizations:
University of Wisconsin, Madison
Department of Civil and Environmental Engineering
1415 Engineering Drive
Madison, WI United States 53706 -
Principal Investigators:
Noyce, David
- Start Date: 20200601
- Expected Completion Date: 20210531
- Actual Completion Date: 0
- USDOT Program: University Transportation Centers
Subject/Index Terms
- TRT Terms: Gap acceptance; Left turns; Microsimulation; Optimization; Oversize loads; Signalized intersections; Traffic signal timing; Vehicle size
- Subject Areas: Highways; Operations and Traffic Management; Safety and Human Factors;
Filing Info
- Accession Number: 01738859
- Record Type: Research project
- Source Agency: Safety Research Using Simulation University Transportation Center (SaferSim)
- Contract Numbers: 69A3551747131
- Files: UTC, RIP
- Created Date: May 7 2020 12:53PM