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

• Possible answers:

   
• A. Instead of sounding the horn in a built-up area between 11.30 pm and 7.00 am
• B. On a motorway or unrestricted dual carriageway, to warn of a hazard ahead
• C. On rural routes, after a sign warning of animals
• D. On the approach to toucan crossings, where cyclists are waiting to cross