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A warrant was developed to choose the appropriate type of left turn signal phasing: permissive, exclusive/permissive, or exclusive. Time-lapse photography was used to observe volume and delay data at a total of six arterial-arterial signalized intersections in the Phoenix metropolitan area. From the time-lapse film, data on volume, number of vehicles stopping, total delay, average delay per stopped vehicle, and average delay for all vehicles was obtained for each turning movement. The effect of the type of left turn signal phasing on left turn delay and through delay was analyzed. A three year history of Accident rates for the three types of left turn phasing were also reviewed. The developed warrant chooses the type of left turn phasing based on left turn volume, opposing volume, number of opposing lanes, cycle length, approach speed, sight distance restrictions, and accident history. (Author)
This study dealt with five types of left turn signal phasing: permissive, leading exclusive, 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), and results of a validation study of the TEXAS computer simulation model. It also presents a research work plan for a future research project.
A warrant was developed to choose the appropriate type of left turn signal phasing: permissive, exclusive/permissive, or exclusive. Time-lapse photography was used to observe volume and delay data at a total of six arterial-arterial signalized intersections in the Phoenix metropolitan area. From the time-lapse film, data on volume, number of vehicles stopping, total delay, average delay per stopped vehicle, and average delay for all vehicles was obtained for each turning movement. The effect of the type of left turn signal phasing on left turn delay and through delay was analyzed. A three year history of Accident rates for the three types of left turn phasing were also reviewed. The developed warrant chooses the type of left turn phasing based on left turn volume, opposing volume, number of opposing lanes, cycle length, approach speed, sight distance restrictions, and accident history. (Author)
Reports for 1975- include activities under the National traffic and motor vehicle safety act of 1966 and the Motor vehicle information and cost savings act of 1972.