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

him. This occurs regularly on busy German motorways, for example. However, this does not mean that you must immediately steer to the right. Always check your own mirrors first. You alone remain responsible for a safe lane change.

Vehicle & Traffic Safety

Sometimes a 

Anyone payingclose attention may see something else happen after the light signal. Truck drivers

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regularly thank each other for this help. For example, a driver who has moved back to the right might briefly use their hazard lights. Sometimes, the left and right turn signals are also used for just a moment.