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When pedestrians walk across roads at night, they can hardly tell the distance between themselves and the coming cars, or the speed of the cars due to the high beams.They can be informed of how much time they might have to get across the road safely by observing the projection of the “safeline”, which is a line projected on the ground from a laser beam embedded in the front of the car. The distance between the projected line and the car is the displacement of the car during the time period in which passengers can walk across it safely. The faster the car is, the longer the distance becomes.