Question

why there no different colours of lines on road except white and yellow?​

Answer 1

Answer:

White lane markings are the most common. Solid white lines define lanes of traffic going in the same direction, or they show you the location of the shoulder of the road. Broken or “dotted” white lines are used to show the center line between lanes. Yellow lines show you where traffic is going in different directions.

Answer 2

Answer:

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Explanation:

Yellow and white form a good contrast with black, making it visible on the road. Even in the night, yellow and white illuminates in order to give illumination. This is the preferred and scientific way of doing the same.