9Any officer of the highway authority duly appointed for the purpose may at all reasonable times, on giving to the nominated undertaker such notice as may in the circumstances be reasonable, enter upon and inspect any part of the works authorised by Part I of this Act which—
(a)is in, over or under any highway, or
(b)which may affect any highway or any property of the highway authority,
during the carrying out of the work, and the nominated undertaker shall give to such officer all reasonable facilities for such inspection and, if he shall be of opinion that the construction of the work is attended with danger to any highway or to any property of the highway authority on or under any highway, the nominated undertaker shall adopt such measures and precautions as may be reasonably practicable for the purpose of preventing any damage or injury to the highway.