@article{ref1,
title="Impact of geometry and operations on left-turn gap acceptance at signalized intersections with permissive indication",
journal="Transportation research record",
year="2021",
author="Claros, Boris and Chitturi, Madhav and Bill, Andrea and Noyce, David A.",
volume="2675",
number="10",
pages="367-380",
abstract="Critical and follow-up headways are the foundation for estimating the saturation flow of permissive left-turns at signalized intersections. Current critical and follow-up headways recommended in the 2016 Highway Capacity Manual (HCM) are based on limited data collected from five intersections in Texas in the 1970s. This study analyzed over 2,500 left-turning vehicles at 45 intersection approaches, provides insights into gap acceptance parameters, and evaluates the effect of different site-specific factors. Video data were collected and processed from different geographical regions in the United States--Arizona, Florida, North Carolina, Virginia, and Wisconsin. Using the maximum likelihood method to estimate gap acceptance parameters, the mean critical headway was 4.87 s and the mean follow-up headway was 2.73 s. To account for site-specific characteristics, the effect of several geometric and operational variables on critical and follow-up headway were explored. Through a meta-regression analysis, the posted speed limit and width of opposing travel lanes were found to have a significant effect on gap acceptance parameters. <br><br>RESULTS showed that with decreasing posted speed limit and width of opposing lanes, critical and follow-up headways also decreased, resulting in greater saturation flows. When site-specific saturation flow estimates were compared with HCM saturation flow estimates, the differences ranged from −30% to +23%. This paper quantifies and illustrates the impact of site-specific characteristics on gap acceptance parameters and saturation flow.<p /> <p>Language: en</p>",
language="en",
issn="0361-1981",
doi="10.1177/03611981211011476",
url="http://dx.doi.org/10.1177/03611981211011476"
}