After overtaking, the truck behind you flashes briefly once: this is what the driver wants to tell you.

of light does not mean you are granted permission to change lanes. Nor does it give you the right of way. At most, the driver behind you can indicate that he sees sufficient space.

That difference is important. Therefore, always keep looking yourself before moving to the right. Check your mirrors and maintain sufficient distance from the  truck . Also, do not drive directly in front of the truck. Heavy vehicles require much more distance to come to a stop. Extra space between your car and the truck is therefore always wise.

Not every flash of light means the same thing.

If you see a truck flashing behind you, pay close attention to the moment it happens. Does the flash occur exactly after you have