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Why that polite headlight flash now carries a £200 fine and three penalty points

Flashing your headlights to wave another driver out of a side road is one of the most common acts of courtesy on British ...
WDTN

Headlight flashing: What it really means and is it illegal?

JOPLIN, Mo. — Flashing headlights can actually mean a few different things, depending on the context. Fortunately, it only takes a second to check the two most common things the other driver is trying ...