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When should you use hazard warning lights?

A When you slow down quickly on a motorway because of a hazard ahead
Hazard warning lights are fitted to all modern cars and some motorcycles. They should be used to warn
+ other road users when your vehicle is causing a temporary obstruction, for example after a collision or when it’s broken down
+ following drivers on a motorway of a hazard or obstruction ahead.
They should not be used as an excuse for dangerous or illegal parking.
B When you leave your car at the roadside to visit a shop
C When you wish to stop on double yellow lines
D When you need to park on the pavement