Hazard awareness

On a motorway you see a queue of stationary traffic ahead. How can you warn the drivers behind you?

Wave your arm out of the window
Brake hard several times
Switch on your full beam headlights
Briefly switch on your hazard warning lights
Correct

Why?

Rule 116 of The Highway Code says on a motorway or unrestricted dual carriageway you may briefly use your hazard warning lights to warn the drivers behind you of a queue or obstruction ahead.

Highway Code rule 116

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On a motorway you see a queue of stationary traffic ahead. How can you warn the drivers behind you?

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