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When may you use hazard warning lights?

A When you have broken down
Explaination
Hazard warning lights may be used to warn other road users when you have broken down and are causing an obstruction, or are on a motorway and want to warn following traffic of a hazard ahead. Don’t use them when being towed or when parking illegally.
B To park alongside another car
C To park on double yellow lines
D When you are being towed