WHEN SHOULD YOU NOT FLASH HEADLIGHTS
Flashing headlights is all too common and is actually more dangerous than many of us think. There are many scenarios where this can prove dangerous and this is just one example that happens relatively frequently.
Flashing your headlights to another vehicle to allow them to proceed can be dangerous
As illustrated in the diagram, the yellow car is waiting to pull out of a T-junction to turn right into a busy road. The red car flashes their headlights to let the driver of the yellow car know that they can proceed. It’s being courteous and polite of the red car to do this, the problem is however, the driver of the yellow car does not want to impede the progress of the red car (or any others) and so makes a hasty exit of the T-junction into position in front of the red car. In the yellow cars speedy exit from the T-junction, they failed to see the cyclist approaching from the right.
This situation can apply to flashing a pedestrian to cross the road or at a
Zebra crossing, a cyclist to cross the road or exit a junction or many other situations. The problem is that when you flash headlights to signify that someone may proceed, they often react on impulse almost as though they have been given an order. They then take the safety out of their own hands and puts it into the driver who flashed their lights.
The correct procedure, if you intend on being courteous and letting someone cross or out of a
junction is to slow down (if safe to do so) and allow a large enough gap for them to move into or cross and to
not signal to them to proceed at all. They will use their own initiative to take this opportunity and to use the correct observation before proceeding. If you really are a persistent headlight flasher, before spontaneously flashing someone, try to ensure it is safe for them to proceed before flashing.