Impact of Left-Turn Phasing on Older and Younger Drivers at High-Speed Signalized Intersections
Publication: Journal of Transportation Engineering
Volume 133, Issue 10
Abstract
The study reports on research that evaluated the impact of different types of left-turn phasing on older and younger drivers at high-speed signalized intersections. Using Poisson regression, the likelihood that a driver in a particular age group would be responsible for a left-turn crash under different types of phasing was evaluated. The induced exposure method was used to estimate exposure by age group. The variable of interest was left-turn crash rate for left-turning drivers who were responsible for circumstances contributing to the crash. Older drivers had higher crash rates than younger or middle-aged drivers for all types of phasing. Younger drivers had higher crash rates than middle-aged drivers for all types of phasing. All three age groups had the highest crash rate under protected/permitted and then permitted phasing within their respective age group.
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Acknowledgments
The research team wishes to thank the Iowa DOT for support of this project. Special thanks to Mr. Tom Welch and Mr. Tim Simodynes for their assistance in completing the project. We would also like to thank all the engineers and technicians who supplied data for this research project, especially those who work for the City of Waterloo, Iowa, who provided a significant amount of information for this study.
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Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 133 • Issue 10 • October 2007
Pages: 556 - 563
Copyright
© 2007 ASCE.
History
Received: Mar 13, 2006
Accepted: Feb 22, 2007
Published online: Oct 1, 2007
Published in print: Oct 2007
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