Citation

Qu X, Kuang Y, Oh E, Jin S. Traffic Injury Prev. 2014; 15(1): 89-93.

Affiliation

Griffith School of Engineering , Griffith University , Gold Coast , Queensland , Australia.

Copyright

(Copyright © 2014, Informa - Taylor and Francis Group)

DOI

10.1080/15389588.2013.782400

PMID

24279971

Abstract

OBJECTIVE: This article is to assess the performance of 3 macroscopic safety indicators (speed, speed dispersion, and volume) and two microscopic potential crash risks (time to collision and deceleration rate to avoid crash) on safety evaluation for expressways.

METHODS: Field data were collected at 3 locations for 4 different time periods on an expressway in Beijing, China. The speed of each vehicle, headway time, and vehicle length were recorded by a traffic management system. The 5 safety indicators were thus calibrated on the basis of the collected data. Further, consistency and comparative analyses were applied to assess the performance of indicators.

RESULTS: According to the analyses, speed dispersion was a better predictor of the two microscopic potential risks compared to the two macroscopic indicators.

CONCLUSIONS: Speed dispersion is recommended to proactively assess road safety because (1) it provides consistent risk evaluation with microscopic potential risks and (2) it makes data collection easier.

Language: en