Final answer:
Vehicles with cabs must have safety belts and powered wipers, both of which serve as vital safety features to protect passengers and maintain clear visibility.
Step-by-step explanation:
All vehicles with cabs must be equipped with safety belts and powered wipers. These are necessary safety features to ensure that the driver and any passengers are protected in the event of a collision or need to have clear visibility during adverse weather conditions. Safety belts, also known as seat belts, are designed to secure the occupants of the vehicle against harmful movement that may result from a collision or a sudden stop. Powered wipers, on the other hand, provide the driver with the ability to maintain visibility through the windshield in rain or snow.