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When are you allowed to use hazard warning lights?

A When stopped and temporarily obstructing traffic
Explaination
You must not use hazard warning lights when moving, except when slowing suddenly on a motorway or unrestricted dual carriageway to warn the traffic behind. Never use hazard warning lights to excuse dangerous or illegal parking.
B When travelling during darkness without headlights
C When parked for shopping on double yellow lines
D When travelling slowly because you are lost