Details:

Creators:
Wei, Heng
Corporate Creators:
University of Cincinnati. Department of Civil and Environmental Engineering
Subject/TRT Terms:
[+]
Dilemma Zone Interchanges And Intersections Roads--Interchanges And Intersections--Safety Measures Signalized Intersections Traffic Safety Yellow Interval (Traffic Signal Cycle)
Resource Type:
Tech Report
Geographical Coverage:
Ohio
Corporate Publisher:
Ohio Transportation Consortium
Abstract:
Dilemma zone at signalized intersection has been recognized as a major potential causing rearend

crashes, and has been widely studied by researches since it was initially proposed as the

GHM model in 1960. However, concepts conventionally defined to represent yellow phase

dilemma lack integrity. This research conducts a comprehensive literature review with attempt to

clarify the interrelationship among dilemma zone, option zone, and indecision (decision) zone,

and to develop a heuristic framework to present the contributing factors in dilemma zone

modeling. A new method for modelling the locations and lengths of the dilemma zone using

video-capture techniques and vehicle trajectory data is presented in this report. First, dilemma

zone is mathematically modeled based on the literature review. Then, field-observed trajectory

data extracted by the video-capturing-based approach are used to calibrate the contributing

factors involved in the dilemma zone models. The high accuracy of the time-based trajectory

data has significantly enhanced the accuracy of the calibrated dilemma zone models. Two sets of

trajectories are explored for calibrating the dilemma zone contributing factors. One is concerned

with maximum yellow-onset safe passing distance and minimum yellow-onset stopping distance.

The other is concerned with Xth percentile yellow-onset passing distance and stopping distance

for the prevailing travel behaviors. The latter alternative actually precludes “too conservative”

and “too aggressive” behaviors in response to yellow indications.


Format:
PDF
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:d619ccb29c7961e7ce0daa094e57cdbb74213eba46cee5c4998e3b34da8bee62
Download URL:
https://rosap.ntl.bts.gov/view/dot/17193/dot_17193_DS1.pdf
File Type:

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