Which of the following types of vehicles must have a low rear collision protection bumper?

1. Commercial vehicles with a rear extension that covers 60% of the axle distance.
2. Commercial vehicles, trailers and semi-trailers with an all up weight of 3,500 kg or less.
3. Connected vehicles, integral commercial vehicles and semi-trailer trucks with an all up weight of more than 15,000 kg.
4. Correct answer: Commercial vehicles, trailers and semi-trailers, and work vehicles with an all up weight of more than 3,500 kg.

WhyA low rear collision bumper is fitted to commercial vehicles, trailers, semi-trailers and work vehicles over 3,500 kg. It keeps a car from sliding under the body in a rear impact.