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Nature Science : Why are the trees on the side of the roads painted white? Know the interesting science behind it…
Sandy Verma | July 18, 2026 10:24 AM CST

Nature Science: While traveling on the highway or any other road, we always see trunks of trees on both sides of the road painted white on the underside. Seeing this, many people wonder if the trees are given this color only for beauty? However, behind this is not only beauty, but there is a big scientific reason behind it and the safety point of view of drivers. Why this campaign is conducted every year by the administration and forest department, let’s know about it…

Protection of trees from pests and diseases

The white paint applied to tree trunks is not simple paint, but water lime. Due to the natural ingredients in lime, the bark of the trees does not suffer from pests, fungi or desiccation. This keeps away insects that enter the tree, which increases the life of the tree and prevents the trunk from rotting. Nature Science

Protection of trunks from intense heat

The sun’s rays are very intense during summer days. This intense heat often cracks the bark and weakens the plants. White color reflects sunlight. Thus, the temperature of the trunk of the tree is controlled and the tree is not damaged by the intensity of the sun. Nature Science

‘Natural Reflector’ in Night Travel

Many national highways or roads in rural areas do not have street lights. Driving in the dark at such times can be dangerous. The white paint on the trees glistens from a distance in the light of the headlights of the vehicles. This provides the drivers with accurate information about the road and curves, which can largely prevent accidents at night. Nature Science

Official Record of Forest Department

Another important administrative use of this color is tree protection. Trees whose trunks are given such a distinctive white or reddish-white color indicate that the trees are under the care of the forest department or local administration. Due to this no one can cut down these trees illegally. It is considered as an official government registry of trees. Nature Science

The white color applied to the trees is a perfect combination of nature conservation and human safety. This not only preserves the environment, but also makes the journey of passengers traveling on the road safer. Nature Science


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