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.
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It is not official permission
Although many truck drivers understand these signals, they are not official traffic rules.
In the Netherlands, according to traffic regulations, flashing and audible signals primarily serve a function in the event of imminent danger. Therefore, legally, a brief flash of light does not mean you are granted permission to change lanes.
