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They could overload the electrical system
They could cause the battery to fail
They could stop the indicators working properly
They can be confused with brake lights
Explanation: If you don't switch off rear fog lights when the fog has lifted, drivers behind may find it difficult to see your brake lights. This can be a particular problem on wet roads and on motorways. If you leave your rear fog lights on at night, drivers behind are likely to be dazzled and this could put you both at risk.
Category: Band 3 driving test
References: The Official DVSA Guide to Driving: Section 12, Highway Code: Rule 236
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