Development, Evaluation and Application of Left Turn Signal Warrants

摘要

This study dealt with five types of left turn signal phasing: permissive, leadingexclusive, lagging exclusive, leading exclusive/permissive and lagging exclusive/permissive. The objectives of this research project were to: (1) develop a research work plan to conduct a statistically valid study for the development of numerical warrants for left turn movements, and (2) prepare a database of available information on signalized intersections and select the intersections to be used in the future study. This report describes the database of Arizona signalized intersections created in this project, the findings on left turn accident rates for different types of left turn phasing (using a nonrandom sample), results of a validation study of the TEXAS computer simulation model, and presents a research work plan for a future research project.