11(1)Where the reference relates to the placing, altering or changing the position of apparatus in a road which is carried by or goes under a bridge, then, if the arbiter is satisfied—
(a)that the execution of the works would be likely to affect injuriously the structure or stability of the bridge, and
(b)that it is not practicable to meet objection on that ground to the plan and section submitted,
he shall so declare, and shall not settle any plan and section of those works on the reference.
(2)This does not affect the right of the undertaker to submit another plan and section.