Question

Explain why bridges have expansion joints in

Answer 1

Bridges have expansion joints as they are made of steel and metals like steel expand during summers due to heat and contracts during winters. If they is no expansion joints in bridges then the steel could not expand or contract. This might cause it to break.

Hope i helped you:)

Answer 2

Bridges are made of steel. This means that they expand and contract depending on he weather. If there were no expansion joins installed, the bridge would fall apart due to not being able to move.