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When you've parked on double yellow lines
When you've stopped your vehicle and it's temporarily obstructing traffic
When you're driving at night without headlights
When you're driving slowly because you're lost
Explanation: Use hazard warning lights when your vehicle is stationary, to warn that it's temporarily obstructing traffic. Never use them to excuse dangerous or illegal parking. You may also use hazard warning lights while you're driving on a motorway or unrestricted dual carriageway if you need to warn traffic behind of a hazard ahead.
Category: Band 2 traffic signs and signals
References: The Official DVSA Guide to Driving: Section 3, Highway Code: Rule 116
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