In North Carolina, a wet pavement detection system on I-85 yielded a 39 percent reduction in the annual crash rate under wet conditions.
Analyses performed included a before and after study as well as a comparison study along a similar stretch of nearby interstate. Crash data was obtained from the NCDOT's Traffic Engineering Accident Analysis System database and volume data was obtained from the 2002 NCDOT Average Annual Daily Traffic (AADT) maps. The before data was collected for 270 days and the after data collected for 217 days. The data was then converted to yearly crash rates for comparison purposes. The NCDOT also chose a section of I-85 in Gaston County that experienced among other factors, similar weather conditions, traffic volumes, and vehicle fleet to use for the comparison analysis.
- The WPDS reduced the yearly wet crash rate by 39 percent.
- The WPDS reduced the yearly injury crash rate by 35 percent.
- The average daily crashes per day dropped by 58 percent on days defined as having heavy precipitation.
Traffic Safety Effects of a Wet Pavement Detection System Installed on a North Carolina Interstate: A Statistical Summary of Crash Data for a Temporary On-Site Detour inside an I-485 Construction Zone in Mecklenburg County
Author: Lowry, Stephen D.
Published By: North Carolina DOT
Source Date: August 2004
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