You’re driving on a motorway. The traffic ahead is braking sharply because of an incident. How could you warn traffic behind?

Explanation: While the car is in motion, hazard warning lights are only allowed to be used if you're travelling on a motorway or unrestricted dual carriageway and you want to warn traffic behind of a hazard ahead. Only use them for a short period of time - just long enough to ensure that your warning has been seen.

Category: Band 2 traffic signs and signals

References: The Official DVSA Guide to Driving: Section 3, The Official DVSA Guide to Driving: Section 11, Highway Code: Rule 116