Why are vehicles fitted with rear fog lights?

Possible Answers:

a. To make them more visible when driving at high speed

b. To show when they've broken down in a dangerous position

c. To make them more visible in thick fog

d. To warn drivers following closely to drop back

Think you know the answer to this theory test question?

Crown copyright material is reproduced under licence from the Driver and Vehicle Standards Agency, which does not accept any responsibility for the accuracy of the reproduction. The Driver and Vehicle Standards Agency does not endorse in any way any advertisement displayed on this website.