They are also called hazard flashers and hazard lights.
Hazard warning lights on motorway.
Whilst driving on motorways and dual carriageways at high speed reaching hazards or obstructions ahead happens quickly.
One use of hazard warning lights which is allowed briefly is if you have to stop abruptly on a motorway or unrestricted dual carriageway for an obstacle but there is not a vehicle immediately behind you.
You can use your hazard warning lights to warn any vehicles approaching from behind that you are stationary.
The highway code also states that hazard warning lights should not be used while driving or being towed.
When it is safe to do so get out of the vehicle and move behind the barrier.
For example if you have to slow down sharply because of a build up of traffic ahead you can use the hazard warning lights to warn following vehicles that they need to slow down.
The rules on when you should use hazard warning lights are more limited when you re driving or being towed.
Different countries use hazard warning lights in different ways.
In new zealand we wouldn t use them on a motorway to warn other drivers that we re slowing down but in the uk this is recommended.
Different countries use hazard warning lights in different ways.
Activating hazard warning lights provides drivers behind that a hazardous situation is ahead.
If your vehicle breaks down on a motorway drive it to the hard shoulder and switch on the hazard warning lights to warn following traffic.
The only exceptions to this rule are if you are on a motorway or unrestricted dual carriageway and you need to warn drivers behind you of a hazard or obstruction ahead.
In fact you should never use your hazards when moving unless you need to warn those behind you of danger ahead and you are on a motorway or an unrestricted dual carriageway.
Drivers risk being hit with 2 500 fine for wrongly using their hazard lights drivers could face a 100 on the spot fine rising up to 2 500 for simply using their hazard warning lights when.
