Understanding factors affecting safety effects of indirect driveway left-turn treatments.

Author(s)
Lu, J.J. Liu, P. & Lu, L.
Year
Abstract

This article summarizes research that evaluates the effects of various contributing factors on the safety effects of an important indirect driveway left-turn treatment: using U-turns as alternatives to direct left turns from driveways. Crash data were collected at 140 roadway segments where U-turns are used as alternatives to replace direct left turns from driveways, and 32 three-leg unsignalized intersections where direct left turns from driveways are permitted. It was found that U-turn crashes only account for a very small percentage of crashes related with right turns followed by U-turns (RTUT). U-turn crashes occur very infrequently at median openings and signalized intersections. The majority of crashes related with RTUT occur at the section between driveways and downstreamU-turn locations. A crash predictionmodel was developed to identify the factors that contribute to the crashes related with RTUT at weaving sections (the segments between driveways and downstream U-turn locations). The model shows that the major street average daily traffic (ADT), the location of U-turn bay, and the separation distances between driveway exits and downstream U-turn locations significantly impact the safety of RTUT at weaving sections. (Author/publisher)

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Publication

Library number
20090459 ST [electronic version only]
Source

Journal of Transportation Safety & Security, Vol. 1 (2009), No.1 (March), p. 61-73, 18 ref.

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This publication is one of our other publications, and part of our extensive collection of road safety literature, that also includes the SWOV publications.