Without prejudice to the provisions of paragraph 7 above, the nominated undertaker shall provide, or afford reasonable facilities for the port authority to provide and maintain, at the viaduct over the river comprised in Work No. 13, such navigational lights or other apparatus for the benefit of navigation as the port authority may reasonably consider necessary by reason of construction of the viaduct or the carrying out of operations for its construction.

The nominated undertaker shall pay to the port authority the costs reasonably incurred by it in connection with the provision and maintenance of that apparatus.