Q #230 - When should you use hazard warning lights?
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 shouldn't be used as an excuse for dangerous or illegal parking.
When you slow down quickly on a motorway because of a hazard ahead
When you leave your car at the roadside to visit a shop