A Field and Simulator Evaluation of All-Red Clearance Intervals for Use in Left-Turn Applications

Knodler, Michael A.; Santiago-Chaparro, Kelvin R.; Christofa, Eleni; Bill, Andrea R.; Tainter, Francis; Noyce, David A. (David Alan), 1961-; University of Massachusetts at Amherst. Dept. of Civil and Environmental Engineering; University of Wisconsin--Madison. Dept. of Civil and Environmental Engineering

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A Field and Simulator Evaluation of All-Red Clearance Intervals for Use in Left-Turn Applications

2018-03-01
By Knodler, Michael A. ; Santiago-Chaparro, Kelvin R. ; Christofa, Eleni ; ...

[PDF-4.75 MB]

English

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Creators:

Knodler, Michael A. ; Santiago-Chaparro, Kelvin R. ; Christofa, Eleni ; Bill, Andrea R. ; Tainter, Francis ; ... More +

Knodler, Michael A. ; Santiago-Chaparro, Kelvin R. ; Christofa, Eleni ; Bill, Andrea R. ; Tainter, Francis ; Noyce, David A. (David Alan), 1961- Less -
Corporate Creators:

University of Massachusetts at Amherst. Dept. of Civil and Environmental Engineering ; University of Wisconsin--Madison. Dept. of Civil and Environmental Engineering

University of Massachusetts at Amherst. Dept. of Civil and Environmental Engineering ; University of Wisconsin--Madison. Dept. of Civil and Environmental Engineering Less -
Corporate Contributors:

Safety Research Using Simulation (SAFER-SIM) University Transportation Center
Subject/TRT Terms:

[+]

Clearance Interval (Traffic Signal Cycle) Flashing Traffic Signals Flashing Yellow Intervals Left Turn Phase Red Interval (Traffic Signal Cycle) Signalized Intersections Traffic Signal Intervals Traffic Signals Yellow Interval (Traffic Signal Cycle)
Resource Type:

Tech Report
Geographical Coverage:

United States
Corporate Publisher:

Safety Research Using Simulation (SAFER-SIM) University Transportation Center
Abstract:

As the implementation of the novel flashing yellow arrow (FYA) traffic control device advances throughout the country, agencies continually seek ways to improve intersection operations and safety, especially on left turns. For example, permissive left-turn intervals have been communicated to drivers using several traffic signal indications; however, most frequently these phases are represented using the circular green ball and, more recently, the FYA. Previous research in this area found that the FYA indication produced the most effective communication of permissive left-turns. As a result of the research findings, the FYA was included in the 2009 edition of the Manual on Uniform Traffic Control Devices. In recent years, agencies across the country have embraced the implementation of the FYA for permissive left-turns. However, a lack of national guidance remains on how to define the change and clearance intervals for transitioning between protected and permissive left turns. Complicating the matter is the connection between traditional signal phasing/design and human factors. Research on driver comprehension and real-world operations of the transition between protected and permissive left turns will allow evaluation not only of current conditions, but also of experimental and future conditions. This report presents findings from a static survey that studied the expectation of drivers after a signal indication is presented. This report also presents the results of a novel exploratory approach that allows the use of vehicle trajectory data to gain an insight into driver behavior during the transition between a protected left-turn movement and a permissive one. Research findings will provide a foundation for narrowing the scope and identifying elements that should be considered during a driving simulator evaluation.
Format:

PDF
Collection(s):

University Transportation Centers US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:1436d6b9178b2185d33b2d41bef9ae3dd055263df8ac6f479bf3baf0218155e6
Download URL:

https://rosap.ntl.bts.gov/view/dot/36047/dot_36047_DS1.pdf
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A Field and Simulator Evaluation of All-Red Clearance Intervals for Use in Left-Turn Applications

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