General rules, techniques and advice for all drivers and riders•Rule 116
Proper Use of Hazard Warning Lights
This rule is a legal requirement
Hazard warning lights. These may be used when your vehicle is stationary, to warn that it is temporarily obstructing traffic. Never use them as an excuse for dangerous or illegal parking. You MUST NOT use hazard warning lights while driving or being towed unless you are on a motorway or unrestricted dual carriageway and you need to warn drivers behind you of a hazard or obstruction ahead. Only use them for long enough to ensure that your warning has been observed.
💡Example
Use hazard warning lights when your vehicle is stationary and causing a temporary obstruction. For instance, if your car breaks down on a busy road, turn on the hazard lights to alert other drivers. Do not use them while driving unless on a motorway or dual carriageway to warn of a hazard ahead.
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