Impact of Driving, Non-Driving Work, and Rest Breaks on Driving Performance in Commercial Motor Vehicle Operations

摘要

This study, sponsored by the Federal Motor Carrier Safety Administration (FMCSA), was directed at analyzing several issues regarding the commercial motor vehicle (CMV) hours-of-service (HOS) regulations. Topics including driving hours, work hours, and breaks as a function of time-on-task have not been well explored in the published literature. The present study focused on four key issues relevant to the HOS regulations: (1) Workday Characterization: What activities comprise an average workday for long-haul and line-haul drivers. (2) Driving Hour: What is the impact of time-on-task on the risk of safety-critical events (SCEs) as a function of driving hour. Specifically, and critical to increasing the knowledge base on the HOS regulations, is there a significant increase in risk associated with the 11th hour of driving. (3) Work Hour: What is the impact of time-on-task on the risk of SCEs as a function of work hour. This is a topic that has not been previously studied. (4) Breaks: What is the impact of time-on-task on the risk of SCEs as a function of breaks from the driving task. Are breaks from driving used to perform other work-related tasks impacting SCEs in a similar manner as breaks to rest.