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When may you use hazard warning lights while you’re driving?

Instead of sounding the horn in a built-up area between 11.30 pm and 7.00 am

On a motorway or unrestricted dual carriageway, to warn of a hazard ahead
On rural routes, after a sign warning of animals

On the approach to toucan crossings where cyclists are waiting to cross

When there’s queuing traffic ahead and you have to slow down or even stop, briefly showing your hazard warning lights will help alert following traffic to the hazard.