Question

why are tyres of heavy trucks made broader​

Answer 1

Answer:

Why do heavy vehicles have broad tyres? Heavy vehicles have broad tyres because broad tyres have large area of contact and less pressure on the ground. Because of this, heavy vehicles (like tractor) can move even on soft roads and fields without sinking.

Answer 2

Because, the truck surface was very heavy and it have too much of weight to support its weight and to maintain the truck the broader wheels are used.