This picture shows trees planted on both sides of the road provide cooling effect from scorcing sun. This road is located somewhere in Labuan, Malaysia. This road is not frequented by large 20 or 40 footer trailers and due to that the trees looks very beautiful. If there are trailers passing through the road, then the canopy will usually take such a shape due to the brunt of the trailers.
Road users should not press their pedal too hard if they travel along this type of road because if their vehicle is out of control due to whatever reasons (tyre burst, avoiding hitting other objects, etc) the accident will most likely be severe. These are the drawback of planting trees along both sides of the road.