hours of service rules for cmv
Drivers are more likely to be involved in an unsafe driving event if their driving hours occur towards the end of a 14-hour shift rather than the beginning. In the United States, hours-of-service (HOS) regulations for commercial motor vehicle (CMV) drivers have been in place since 1940. These regulations have controlled the maximum daily drive time, workday hours, and work week (period) hours for CMV drivers. The regulations have been updated several times since 1940 in order to improve CMV driver safety. The most recently updated HOS regulations are expected to have a compliance date of July 1, 2013.