01127058

Component

The use of non-traversable median cross sections and directional median openings has generated increased numbers of U-turning vehicles at signalized intersections. A procedure is needed to help transportation professionals determine the impacts of proposed median modification projects on traffic operations at downstream signalized intersections. This study is a continuous effort following our previous studies to evaluate the impacts of indirect driveway left-turn treatments on traffic operations at signalized intersections. In this study, a total of 80 hours of traffic data was collected at 66 roadway segments in the Tampa Bay area of Florida. Based on the data collected in the field, the research team developed a negative-binomial model to estimate the expected number of U-turning vehicles on a left-turn approach at a signalized intersection during weekday peak periods. The model has only five independent variables and all of these variables be easily measured in the field. By combining the research results of this study and our previous studies, a complete procedure is provided to help transportation professionals evaluate the impacts of proposed indirect driveway left-turn treatments on traffic operations at downstream signalized intersections.

01120148

09-0973

English

15p

2009

Transportation Research Board 88th Annual Meeting

DVD

Figures (4) ; References (11) ; Tables (3)

Data collection; Driveways; Highway operations; Left turns; Median barriers; Median openings; Operations; Signalized intersections

Downstream traffic

Highways; Operations and Traffic Management; I73: Traffic Control

Transportation Research Board Annual Meeting 2009 Paper #09-0973

TRIS, TRB

Jan 30 2009 5:13PM