Federal Motor Carrier Safety Administration

Sleepy truck drivers cause hundreds of fatal crashes each year. Drivers work in an industry that rewards miles driven, not time on the clock, so many truckers push the envelope just to make a living.

The Federal Motor Carrier Safety Administration keeps drivers in check with so-called Hours of Service Regulations. The regs cap driving time at 11 hours a day. Truckers have to stop and rest for at least a half hour during that time, and no matter how much downtime they may have in between, they have to quit for the day 14 hours after they start.