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When you're driving on the hard shoulder
When you slow down quickly because of danger ahead
When a vehicle is following too closely
When you're towing another vehicle
Explanation: Briefly using your hazard warning lights will warn the traffic travelling behind you that there's a hazard ahead. This can reduce the chance of vehicles crashing into the back of each other.
Category: Incidents, accidents and emergencies
References: The Official DVSA Guide to Driving: Section 3, The Official DVSA Guide to Driving: Section 11, The Official DVSA Guide to Driving: Section 15, The Official DVSA Guide to Driving: Section 16, Highway Code: Rule 116, Highway Code: Rule 274
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