The Federal Motor Carrier Safety Administration (FMCSA) is the division of the U.S. Department of Transportation responsible for preventing commercial motor vehicle-related fatalities and injuries. It does this by setting and enforcing safety regulations, including those for truck drivers and trucking companies. You may have heard of the FMCSA’s hours of service regulations, which attempt to reduce fatigued driving by limiting the number of hours that truck drivers may spend behind the wheel without a break. The FMCSA also regulates many other aspects of commercial vehicle operations, including drug and alcohol testing, training requirements, and vehicle inspection and maintenance.