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You're driving on a motorway. When can you use hazard warning lights?

A When you slow down quickly because of danger ahead
Explaination
Briefly using your hazard warning lights will warn the traffic travelling behind you that there's a hazard ahead. This can reduce the chance of vehicles crashing into the back of each other.
B When a vehicle is following too closely
C When you’re towing another vehicle
D When you’re driving on the hard shoulder