Mark one answer
To thank a driver for giving way to you
When parked illegally on a busy road
To warn other drivers that you're towing
When approaching queuing traffic on a motorway
Explanation: The only time you may use hazard warning lights while driving is when you're on an unrestricted dual carriageway or motorway and you want to warn other drivers of a hazard or obstruction ahead. Only use them for long enough to make sure your warning is seen.
Category: Leaving the Vehicle
References: Highway Code: Rule 116
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