Motorcycle-- Attaching to another vehicle prohibited.

Utah Code § 41-6a-1503, under Part 41-6a-15: Special Vehicles.

Utah Code § 41-6a-1503

41-6a-1503. Motorcycle-- Attaching to another vehicle prohibited.

(1) An individual riding on a motorcycle may not attach themselves to any other vehicle on a roadway.

(2) A violation of this section is an infraction.