There are a variety of buses that travel on Virginia roads: school, transit, charter, sightseeing, and private. But all of these buses fall under the rules of the Virginia Department of Transportation, as well as the jurisdiction of the Federal Motor Carrier Safety Administration (FMCSA). There are regulations regarding the maximum size a bus can be, when they are required to have air brakes, how many axles the vehicle should have, vehicle lighting, and the type of safety glass they may have. There are also requirements bus drivers must meet, as well as how many hours they are allowed to operate.