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You are driving on a motorway. The traffic ahead is braking sharply because of an incident. How could you warn traffic behind you?

A Briefly use the hazard warning lights

The only time you are permitted to use your hazard warning lights while moving is if you are on a motorway or dual carriageway and you need to warn other road users, particularly those behind, of a hazard or obstruction ahead. Only use them long enough to ensure your warning has been seen.