Abstract
Warrants for the installation of left-turn phasing were developed. A review of literature was conducted along with a survey of the policies of other states. Field data of delays and conflicts were taken before and after installation of exclusive left-turn signalization. Left-turn delay studies were conducted at intersections with varying volume conditions. Analysis of the effect on accidents of adding a left-turn phase was made. The relationship between left-turn accidents and conflicts was investigated. Other types of analysis concerning gap acceptance, computer simulation, capacity, and benefit-cost ratios were also performed.
It was found that exclusive left-turn phasing significantly reduced left-turn accidents and conflicts. Left-turn delay was only reduced during periods of heavy traffic flow. Warrants were developed dealing with the following four general areas:
- accident experience,
- delay,
- volumes, and
- traffic conflicts.
Report Date
8-1976
Report Number
No. 456
Digital Object Identifier
http://dx.doi.org/10.13023/KTC.RR.1976.456
Repository Citation
Agent, Kenneth R., "Development of Warrants for Left-Turn Phasing" (1976). Kentucky Transportation Center Research Report. 867.
https://uknowledge.uky.edu/ktc_researchreports/867
Notes
The contents of this report reflect the views of the author who Is responsible for the facts and accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the Bureau of Highways. This report does not constitute a standard, specification, or regulation.