The Impacts of Rests on Truck DriverÍs Crash Risks


Truck drivers are more likely to get involved into crashes because their performance can be jeopardized by the fatigue caused by long time driving and irregular schedule. Thus, truck drivers use different ways to recover their performance which enforced by Hours of Service (HOS) rules include the minimum 10 hours off-duty, 34 hours restart, and the combination sleeper berth. Also, drivers like to take short breaks during their trips though the breaks were ignored before in HOS. But the rule about short breaks will be introduced in the new HOS rules in 2013. This study thoroughly analyzes the impacts of off-duty prior to the last trip and the short breaks during the last trips. In addition, the strategy for multiple events per subject is developed to integrate these two recovery ways. Results indicate that short break is a significant factor in reducing crash risks. The first and the second rest breaks can decrease truck driverÍs crash odds significantly. 0.25 to 0.3 hour of the rest break does decrease the crash risk but longer rest break does not increase this benefit. Also, the effects of two breaks do better after longer driving. However, the third rest break does not have extra benefits compared with the first two breaks. The hazard ratio of break is 0.055 by using the integrated strategy of Anderson-Gill model. However, the off-duty prior to the last trip does not have significant effects as the length increases.