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When may you use hazard warning lights when driving?

A On a motorway or unrestricted dual carriageway, to warn of a hazard ahead
When there’s queuing traffic ahead and you have to slow down or even stop, showing your hazard warning lights will alert following traffic to the hazard. Don’t forget to switch them off as the queue forms behind you.
B Instead of sounding the horn in a built- up area between 11.30 pm and 7 am
C On rural routes, after a warning sign of animals
D On the approach to toucan crossings where cyclists are waiting to cross