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

You are driving on the highway and overtaking a large truck. As soon as you pass it, you suddenly see a brief flash of light in your mirror. You might immediately think the driver is angry or that you are driving too slowly and need to move to the right quickly. However, such a brief light signal after overtaking can have a completely different meaning. In some situations, the truck driver may simply be trying to help you.

Truck drivers use various informal signals on the road. They can send