Journal
TRANSPORTATION PLANNING AND TECHNOLOGY
Volume 37, Issue 3, Pages 307-319Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/03081060.2014.897126
Keywords
simulation; traffic conflict; dual right-turn lane; ramp; highway safety; frontage road; weaving
Categories
Funding
- National Science Foundation (NSF) [113773]
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At frontage road intersections located downstream of freeway off-ramps, the use of dual right-turn lanes may provide improved weaving environments for right-turning vehicles from the off-ramp and reduce forced merges toward the desired right-turn bay. This paper investigates the safety impacts of the installation of dual right-turn lanes at frontage road intersections. A two-stage approach is used to estimate weaving conflicts as safety surrogates. In the first stage, micro-simulation models are calibrated based on field data to simulate vehicle trajectories. In the second stage, the trajectories are processed to estimate surrogate safety measures and frequency of weaving conflicts under different conditions. The two-stage approach is validated by correlation analysis between predicted weaving conflicts and actual crash rates. The results show that dual right-turn lanes can reduce weaving conflicts significantly compared to single exclusive right-turn lanes, and the safety benefits increase exponentially as weaving distance is reduced.
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