(1) Nothing in this Act, or in an order or any rule made under this Act, shall take away or abridge any power which a road-authority, local authority or other person has by law to break up, widen, alter, divert or improve a road, railroad or tramway along or across which a tramway is laid.
     (2) The road-authority, local authority or other person executing any work referred to in sub-section (1) shall not be liable to pay to a promoter, lessee or licensee any compensation for injury done to a tramway by the execution of the work or for loss of traffic occasioned by the reasonable use of any power lawfully exercised for the execution thereof.