when is hours of service required
âThese rules make common sense, data-driven changes to reduce truck driver fatigue and improve safety for every traveler on our highways and roads.â. Trucking companies were provided 18 months to adopt the new hours-of-service rules for truck drivers. First announced in December 2011 by FMCSA, the rules limit the average work week for truck drivers to 70 hours to ensure that all truck operators have adequate rest.