Mark one answer
They'll make drivers behind keep back
They'll dazzle other drivers
They'll protect you from larger vehicles
They'll make it safer when towing a trailer
Explanation: Rear fog lights shine more brightly than normal rear lights, so that they show up in reduced visibility. When the visibility improves, you must switch them off; this stops them dazzling the driver behind.
Category: Vehicle handling
References: The Official DVSA Guide to Driving: Section 12, Highway Code: Rule 114, Highway Code: Rule 226
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