By Keith Laing - 08/07/12 09:23 PM EDT
The hours of service rules for truckers were adopted in December after a vigorous battle between safety advocates and the trucking industry.
The rules, which were implemented by the Federal Motor Carrier Safety Association, limit the number of hours a driver could work to 70 per week.
Under the old rules, truckers could drive 82 hours per week.
Safety advocates had pushed transportation officials to also place a limit on the number of hours truckers could drive each day. However, the new rules require truckers to take a break of at least 30 minutes for every eight hours they drive, but they maintain a daily 11-hour limit on driving.