Signals to other road users

Hazard warning lights

I am temporarily obstructing traffic or warning of a hazard or obstruction ahead (see Rule 116)

What does this signal mean?

Hazard warning lights show that a vehicle is temporarily obstructing traffic or warning of a hazard or obstruction ahead. They may be used while your vehicle is stationary, and on a motorway or unrestricted dual carriageway you may also use them briefly while moving to warn following traffic of a hazard or queue ahead. They must never be used as an excuse for parking illegally, even for a moment. Switch them off once the warning has served its purpose.

Highway Code references

• Rule 116 from General rules, techniques and advice for all drivers and riders (103 to 158)

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