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\ · Recommended Alternate Alternate Alternate .Alternate lA lB 2A 2B Structure $280,000 $387,000 $ 435,000 $ 586,000 Roadway Approaches 131,000- 119,000 453,000 433,000 Detour 169,000 169,000 - Structure Removal 20,000 20,000 20,000 20,000 Right-of-Way, Utilities 43,000 43~000 189,000 189,000 TOTAL $643;000 $738,000 $1,097,000 $1,228,000 ~he above estimates include 10 percent for engineering and contingencies. V. Discussion of Recommended Improvements A. Alignment Two b%asic replacement concepts were studied. The first concept (Alternates iA and lB) consists of three-lane improve- ments (on US 601) along the existing alignment with a temporary detour bridge on the east side. The second concept (Alternates 2A and 2B) consists of five-lane improvements with a slight alignment shift to the west and traffic maintained on the exis.ting bridge. The ttLree-lane concept lends itself to symmetrical widening but the five-lane concept necessitates an alignment shift to the west for two reasons. First, the five-lane structure is of sufficient width that construction in half-stages is possible. Secondly,~ widening to five lanes must be accomplished generally to the west of the existing bridge. Widening symmetrically would encroach upon the existing ramps on the east side of the bridge. This would necessitate revisions to the ramp radii and grades. B. Right-of-Way Shifting the alignment to the west requires acquisition of two residences and the Cabarrus County Ambulance Service in the northwest quadrant of the interchange. These reloca- tions are necessary if the construction of a temporary detour bridge is to be avoided. The cost of these three acquisitions ($146,000) is less than the cost of a temporary detour structure ($169,000). Although acquisition of homes and businesses is never desirable, the removal of associated driveway entrances from the interchange area is justifiable from a traffic operations standpoint. The existihg driveways (especially those opposite the north ramp terminal) are undesirable. Only right-turn access is available. The problem will be compounded with the construction of additional lanes in the interchange area.