Crash Reduction in Wet Weather on M1 with Intelligent Transport Systems

EXTENDED ABSTRACT: In 2006 the speed limit on the northbound carriageway on the M1 (between the Hawkesbury River and Mount White) was increased to 100km/h for dry conditions and designed to drop to 90km/h in wet weather using Intelligent Transport Systems (ITS). This study analyses variation in crashes before and after the implementation of the system for both northbound B and southbound carriageways. The crash data includes fatal crashes, injury crashes and non-injury crashes for both dry and wet conditions. The analysis portrays what worked and what didn’t work with the implementation of an ITS based variable speed system in a motorway environment.