Section 37-1-7501-06001-403 - Major Valley or River Crossings:1. Where a freeway crosses a major valley or river on an existing structure, any utility carried by the structure at the time the highway route is improved may continue to be carried when relocation of the utility would be very costly and provided the utility can be serviced without interference with road users. Expansion of a utility carried by an existing structure across a major valley or river may be permitted provided the utility can be installed and serviced without interference with road users. 2. New utility installations will not be permitted on a structure across a major valley or river at or after the time the highway route is improved, except for special cases as covered in Section 404 of this policy. 37 Miss. Code. R. § 1-7501-06001-403