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

of light after an overtaking maneuver often has a very practical meaning. Below, you can read exactly what that signal entails and why truck drivers do this.
Vehicle & Traffic Safety

Why truck drivers do this

A truck with a semi-trailer can be well over sixteen meters long. This sometimes makes it difficult to

see exactly where the rear of the truck ends from the cab. This plays an important role, especially during overtaking. Moreover,

trucks often drive at approximately

the same speed. As a result, the speed difference during an overtaking maneuver is sometimes only a few kilometers per hour.