Safety-Related Guidelines for Time-of-Day Changes in Left-Turn Phasing

Author:

Davis Gary A.1,Moshtagh Vahid2,Hourdos John3

Affiliation:

1. Department of Civil, Environmental, and Geo-Engineering, University of Minnesota, 122 Civil Engineering Building, 500 Pillsbury Drive SE, Minneapolis, MN 55455

2. SRF Consulting Group, Inc., 1 Carlson Parkway North, Suite 150, Minneapolis, MN 55447-4443

3. Minnesota Traffic Observatory, College of Science and Engineering, University of Minnesota, 122 Civil Engineering Building, 500 Pillsbury Drive SE, Minneapolis, MN 55455

Abstract

The goal of this research was to develop safety-related guidelines for time-of-day use of permissive left-turn phasing that could be implemented with flashing yellow arrows. This effort required describing the variation in left-turn crash risk throughout a representative day and was accomplished by developing statistical models that related the hourly risk on an approach to left-turn demand, opposing traffic volume, and a classification of the approach with respect to operational and geometric features. The models were then embedded in a spreadsheet tool that allowed signal operators to enter—for a candidate intersection approach—a turning movement count and a classification of the approach according to speed limit, left-turn protection, and sight distance availability. The user receives a prediction of how the risk of left-turn crash occurrence varies throughout the day, relative to a user-specified reference condition.

Publisher

SAGE Publications

Subject

Mechanical Engineering,Civil and Structural Engineering

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Field Assessment of Variable Left-Turn Mode by Time-of-Day for Intersections Being Upgraded With Flashing Yellow Arrow Signal Heads and Offset Left-Turn Lanes;Transportation Research Record: Journal of the Transportation Research Board;2024-03-31

2. Developing Decision Boundaries for Left-Turn Treatments;Transportation Research Record: Journal of the Transportation Research Board;2020-04-23

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