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When are you allowed to use hazard warning lights?

When stopped and temporarily obstructing traffic
When travelling during darkness without headlights

When parked on double yellow lines to visit a shop

When travelling slowly because you're lost

You mustn’t use hazard warning lights while moving, except to warn traffic behind when you slow suddenly on a motorway or unrestricted dual carriageway.
Never use hazard warning lights to excuse dangerous or illegal parking.