Amends GS 20-116 to prohibit operating a passenger vehicle on the State's highways with a mattress loaded on top of the vehicle's roof. Defines passenger vehicle as a motor vehicle with a gross vehicle weight rating (GVWR) of less than 10,000 pounds that is designed primarily for the transportation of persons. Excludes the transport of a mattress secured in a truck's rear cargo area. Effective December 1, 2021, and applies to offenses committed on or after that date.