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After overtaking, the truck behind you flashes briefly once: this is what the driver wants to tell you.
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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. By doing so, the driver is essentially simply saying: thank you.
It is a kind of informal language among road users . There are various types of these signals. However, they are not all officially defined and can differ from country to country. Therefore, if you see such a signal, you must always assess the situation. After all, a flash of light can mean something else at other times.