The employee may be exposed to diesel fumes, airborne particles, varying weather conditions, moderate to loud noise levels, vehicle vibration, uneven or slippery walking surfaces, loading docks, warehouses, terminals, and public roadways. Operate a semi-tractor/trailer in interstate and intrastate commerce for up to 11 hours following required off-duty periods, with trips ranging from several days to one week or more, while maintaining compliance with DOT Hours of Service regulations.