Details:

Creators:
Appiah, Justice ; Wu, Zifeng ; Rilett, Laurence R.
Appiah, Justice ; Wu, Zifeng ; Rilett, Laurence R. Less -
Corporate Creators:
Nebraska Transportation Center
Corporate Contributors:
Nebraska. Dept. of Roads
Subject/TRT Terms:
[+]
Advanced Driver Information Systems Automated Highway Systems Dilemma Zone Driver Support Systems Traffic Safety
Publication/ Report Number:
NTC report TSPT1-03
Resource Type:
Tech Report
Geographical Coverage:
Nebraska
Corporate Publisher:
Nebraska Transportation Center
Abstract:
"Driver behavior within the dilemma zone can be a major safety concern at high-speed signalized intersections. The

Nebraska Department of Roads (NDOR) has developed and implemented an actuated advance warning (AAW) dilemma

zone protection system. Although these systems have received positive reviews from the public—and commercial vehicle

operators in particular—there has been no comprehensive analysis of their effects on safety and traffic operations. The

focus of this research was to conduct a quantitative study to ascertain the efficacy of the NDOR advance warning system.

First, crash records from before and after the implementation of the system at 26 intersections were compared. In addition,

29 control intersections were used to compare crash rates over time, and a fully Bayesian technique was employed to

ensure that no exogenous variables affected the study. Results of the safety analysis were promising (a 43.6% reduction in

right-angle crashes) and suggested that the use of the system should be encouraged as an effective safety treatment for the

dilemma zone problem at high-speed signalized intersections. Second, a non-intrusive data collection system was used to

monitor traffic and to collect a continuous stream of data up to 1,000 ft upstream of the stop line at two high-speed

signalized intersections equipped with the system. The results suggested that the system was effective at alerting drivers to

the impending end of the green signal: approximately 78% of drivers observed in this study either maintained their speeds

or slowed down when the signs began to flash. It was also found that the number of vehicles in their dilemma zones when

the signal indication changed from green to amber was 77.2% smaller than the number that would have been expected if

the NDOR AAW system had not been installed. Finally, a modeling framework was developed that could be used to

perform consistent, detailed analyses of these systems. Results from two demonstration studies indicated that the proposed

procedure had potential for studying these systems in a microsimulation environment."


Format:
PDF
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:36813d7b682d3a27a0c97ec5782d877ecc711356ff88a1857c03b3c3c027d86d
Download URL:
https://rosap.ntl.bts.gov/view/dot/25286/dot_25286_DS1.pdf
File Type:

Supporting Files

• No Additional Files

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