Abstract
The goal of this research was to develop safety-related guidelines for timeof-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 traffc volume, and a classifcation 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 classifcation 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-specifed reference condition.
Original language | English (US) |
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Pages (from-to) | 100-107 |
Number of pages | 8 |
Journal | Transportation Research Record |
Volume | 2557 |
DOIs | |
State | Published - 2016 |