Hours of Service
Most drivers must follow the HOS Regulations if they drive a commercial motor vehicle, or CMV.
In general, a CMV is a vehicle that is used as part of a business and is involved in interstate commerce and fits any of these descriptions:
Weighs 10,001 pounds or more
Has a gross vehicle weight rating or gross combination weight rating of 10,001 pounds or more
Is designed or used to transport 16 or more passengers (including the driver) not for compensation
Is designed or used to transport 9 or more passengers (including the driver) for compensation
Is transporting hazardous materials in a quantity requiring placards
Hours of Service Final Rule for Truck Drivers.