Which of the following commercial vehicles must be equipped with mud protectors?

1. Correct answer: Every vehicle that its rear wheels are not protected by wings, except for tractors and speed restricted vehicles.
2. Only commercial vehicles with an all up weight of more than 4,000 kg.
3. Only freight carrying vehicles.
4. Every vehicle that is used for transportation in bulk.

WhyMud flaps are needed on every vehicle whose rear wheels are not covered by wings, except tractors and slow vehicles. Otherwise the wheels throw mud and stones at those behind.