Location
STEW 218AB
Session Number
STEW 218AB
Session Title
Evaluation of Flashing Yellow Operations in Indiana
Track Title
Traffic Operations
Event Description/Abstract
Through the support of JTRP project SPR-3725, an evaluation of options for the implementation of flashing yellow arrows for permissive left turns was evaluated. A review of the findings of the final report will be presented. This will include results of a survey about driver response to signal heads and data from field observations of actual driving behavior at the two test sites in Indiana. The result of this research concluded that there was no observable data demonstrating that mixed orientation traffic signals would present a safety issue for drivers. In conjunction with results from NCHRP Project 20–07, there is reason to believe that safety would be improved by placing the left turn signal in a horizontal orientation while leaving the adjacent through signals in a vertical orientation.
Findings from Indiana Flashing Yellow Arrow Study
STEW 218AB
Through the support of JTRP project SPR-3725, an evaluation of options for the implementation of flashing yellow arrows for permissive left turns was evaluated. A review of the findings of the final report will be presented. This will include results of a survey about driver response to signal heads and data from field observations of actual driving behavior at the two test sites in Indiana. The result of this research concluded that there was no observable data demonstrating that mixed orientation traffic signals would present a safety issue for drivers. In conjunction with results from NCHRP Project 20–07, there is reason to believe that safety would be improved by placing the left turn signal in a horizontal orientation while leaving the adjacent through signals in a vertical orientation.
