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FUll control of access is proposed in the northwest and southwest quadrants in order to eliminate this problem. (Note: Full control of access in the northeast and sout~east quadrants is also discussed as a "supplementary recommendation" in a subsequent section of this report. ) It should also be noted that full control of access (in the northwest and southwest quadrants) is proposed only in Alternates 2A and 2B. Alternates iA and lB do not require right-of-way acquisi- tion in these quadrants. Therefore, the question of whether to obtain full control of access is not applicable. C. Traffic Detour During the constr~ction period, maintenance of traffic at the studied bridge site is necessary, since no reasonable detour routes are available. In Alternates lA and lB, a detour structure.would be provided immediately east of the existing bridge at an estimated cost of $169,000. Consideration was given to routing US 601 traffic along the existing ramps with an at-grade crossing of NC 49. The estimated cost of necessary pavement construction and signalization is $16,000. The Traffic. Engineering Branch has determined that an at-grade 'intersection is not desirable due to safety considerations, high traffic volumes, and proximity to the bridge construction. In Alterhates 2A and 2B, the permanent structure would be constructed in half-sections (slightly west of the existing bridge) so that traffic could be maintained on the existing bridge. D. Basis For Multi-Lane Facilities 1o As mentioned previously, the projected traffic volume on NC 49 is 18,800 VPD. The additional cost of providing four lanes (rather than two) underneath the studied bridge ranges from $95,000 to $141,000 (depending upon alternates compared). Provision of an ultimate four-lane divided facility is warranted on the basis of projected traffic volumes. A four-lane divided section exists on NC 49 to the east of the project. Also, several existing bridges on NC 49 were constructed to accommodate an ultimate four-lane divided facility. The Cabarrus County Board of Commissioners, by letter of July 26, 1984, advised as follows: "There are a number of reasons why the County feels the North Carolina Department of Transportation should consider a four-lane span over NC 49 at US 601."