Why is it potentially dangerous to leave rear fog lights switched on when they’re not required?

Explanation: Other drivers might think your rear fog lights are your brake lights if you use them in clear weather, and might misunderstand what you're doing. They can also dazzle drivers behind, distracting them from driving safely, particularly at night, in wet conditions, and on motorways. It is illegal to drive in good conditions with fog lights turned on.

Category: Vehicle handling (2021)

References: The Official DVSA Guide to Driving: Section 12, Highway Code: Rule 114, Highway Code: Rule 226