An estimated 15.5 million trucks operate on the roads in the United States. To help keep the roads safe for everyone who uses them, the Department of Transportation requires motor carriers to implement a program of regular inspection and maintenance for the trucks that they operate… whether they have a large fleet, or just a single truck. Commercial drivers play an important part in these programs, and the inspections they perform help to ensure that any problems with a vehicle are identified and repaired before they hit the road.