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