Section 21-1107 - Restrictions on persons in cargo areas of vehicles(a) Subject to subsection (c) of this section, this section applies to:(1) A truck that has a gross vehicle weight rating of 10,001 pounds or more; and(2) A truck/trailer or truck tractor/semitrailer or trailer combination that has a combined gross vehicle weight rating of 10,001 pounds or more.(b) While a vehicle subject to this section is being operated on a highway:(1) The driver may not allow a person to occupy the area of the vehicle primarily intended to carry cargo; and(2) A person may not occupy the area of the vehicle primarily intended to carry cargo.(c) This section does not apply to:(1) An attendant delegated to care for livestock;(2) A vehicle that is controlled or operated by a farmer and is:(i) Used to transport agricultural products, farm machinery, or farm supplies to or from a farm;(ii) Not used in the operations of a common or contract motor carrier; and(iii) Used within 150 miles of the farmer's farm;(3) A vehicle owned or operated by the U.S. Department of Defense if the vehicle is controlled or operated by:(i) Active duty military personnel; or(ii) A member of the military reserves or National Guard on active duty, including personnel on full-time National Guard duty and personnel on part-time training; or(4) A vehicle traveling at a speed of not more than 25 miles per hour.