TY  - JOUR
PY  - 2014//
TI  - Safety evaluation for expressways: A comparative study for macroscopic and microscopic indicators
JO  - Traffic injury prevention
A1  - Qu, Xiaobo
A1  - Kuang, Yan
A1  - Oh, Erwin
A1  - Jin, Sheng
SP  - 89
EP  - 93
VL  - 15
IS  - 1
N2  - 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.<p />  <p>Language: en</p>
LA  - en
SN  - 1538-9588
UR  - http://dx.doi.org/10.1080/15389588.2013.782400
ID  - ref1
ER  -