Although the treatment of non-traversable median sections and directional median openings makes the road segment where the driveway intersects run in a more efficient way, it brings some adverse impacts (i.e. more delay and conflicts) to the downstream intersection. To assess how the increased U-turning vehicles influence the operational performance at the downstream signalized intersection, a total of 80 hours of traffic data and corresponding geometry data were collected at 66 roadway segments in the Tampa Bay area of Florida. Based on the field data collected, a Negative-Binomial model is developed to estimate the expected number of U-turning vehicles on a left-turn approach at a signalized intersection during peak periods. The proposed model has only five independent variables and all of these variables can be easily measured in the field. Combining the research results of this study and our previous studies, a complete procedure is provided to help transportation engineers evaluate the impacts of indirect driveway left-turn treatments on traffic operations at downstream signalized intersections.
Operational Impacts of Indirect Driveway Left-Turn Treatment at Signalized Intersections
11th International Conference of Chinese Transportation Professionals (ICCTP) ; 2011 ; Nanjing, China
ICCTP 2011 ; 324-336
2011-07-26
Conference paper
Electronic Resource
English
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