As shown in the picture, the distance between the white semicircular markings on both sides of the expressway is 50 meters.

ANSWER · A

The white semicircular line is the vehicle distance confirmation line. Its radius is 30 cm. It is placed at intervals of 50 meters and is generally placed continuously within a certain section of road. It appears more frequently on expressways, and the distance between vehicle distance confirmation lines on both sides of the expressway is 50 meters.

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