What does the fishbone line on the highway mean?

1 Answers
Moore
07/29/25 11:58am
Fishbone lines on highways often appear near tunnels, with the main purpose of reminding drivers to slow down. These fishbone lines have solid or dashed lines in the middle, and the spacing is not fixed - it gradually widens from narrow to wide. Initially, the spacing may be only about 10 cm, but as vehicles approach, the fishbone lines gradually become wider. Highways have many markings and signs, each representing different meanings and used in different locations to provide various warnings and instructions to passing drivers. A highway is a multi-lane road exclusively designed for directional and lane-based vehicle traffic, with full access control. The annual average daily traffic volume on highways should ideally exceed 15,000 passenger cars, with design speeds ranging from 80 to 120 kilometers per hour.
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