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

Consequently, a truck can drive alongside another truck for quite a long time.

The driver being overtaken often has a clear view of the end of the other combination. As soon as the entire semi-trailer has passed, he can briefly signal with his headlights. This indicates that there is sufficient room to move back to the right. Such a signal is therefore usually intended

in a friendly manner. The

truck driver is not trying to rush his colleague; he is simply helping him to better estimate the length of his vehicle.
Motorists can also get such a flash.

The signal