It is an offense to drive an open-bed truck, an open flatbed truck, or to draw an open flatbed trailer when:

• A child who is younger than 18 years of age is occupying the bed of the truck or trailer.
  Explanation:

  "It is an offense to drive an open-bed truck, an open flatbed truck, or to draw an open flatbed trailer when a child who is younger than 18 years of age is occupying the bed of the truck or trailer."
• It is operated by someone above 18 years of age.
• It is operated on a highway.
• It is operated in an emergency.