Question

A steel bridge expands in summer. What precautions are taken to make sure this expansion does not damage the bridge?

Answer 1

Hey mate here is ur ans

one side of the bridge must be kept in rollers so that the expansion won't break anything and allows free movement of it
it should be made of gud quality materials which don't expand much on heat

Answer 2

One end of the metal or steel bridge must be fixed and other end of the bridge must be kept at the roller to allow the movements due to thermal expansion.