What is the legal regulation regarding carrying passengers on the open bed of a pickup truck in Antigua and Barbuda?

1. Passengers may sit on the edge of the tailgate while the vehicle is at highway speeds
2. It is illegal and unsafe to carry passengers standing or sitting unsecured on an open truck bed unless proper secure seating and safety sides are provided in compliance with regulations
3. Any number of passengers may be carried on open truck beds without restriction
4. Children may stand in the truck bed if an adult watches them