Why did the lorry flash its high beams?
When a lorry passes another, it is usually hard for the passing driver to know when the rear end of his trailer has passed and it is safe to move back to the right lane. The one who gets passed will therefore often flash the high beams as a signal indicating when it is time to change lanes.
Other resons may include: salute a friend, signal to an oncoming to switch to low beams, mistake when fumbling for another control and a signal that something is wrong with the vehicle ahead.
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