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

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