Line of sight induction facilities are set along the two sides of the carriageway and used to express the alignment, direction, boundary of carriageway and location of dangerous sections, to guide the driver's line of sight. Driving on the road, vehicles need a certain viewing distance to master the situation in front of the road, especially at night, it is difficult to figure out the alignment in front of the road and master the direction by relying on the headlights. The illumination range of the car headlights is limited, so it is necessary to rely on the induction facility to achieve the visible distance.
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