有法律, 不论大小公司. 大卡司机每天只能开x小时, 睡x小时. 现在有GPS追踪

A truck driver can drive for up to 11 hours for every period of 14 consecutive hours that the driver is on-duty, according to the Federal Motor Carrier Safety Administration. Between each 14-hour block of work time, there must be an off-duty period of no less than 10 consecutive hours.