Project NH000-0056-01(061), funded entirely with State monies, consists of approximately 0.4 miles of widening along Northridge Road. Widening improvements would include additional signage for the northbound exit ramp from SR 400, additional through lanes on Northridge Road to accommodate improved traffic flow, and a replacement of the existing bridge. The proposed project would widen the northbound and southbound entrance and exit ramps, replace the Northbridge Road bridge over SR 400, Northridge Road, Dunwoody Place and Roberts Drive. The northbound entrance will be on new location and terminate approximately 1900 feet north of its current location. The project would terminate at the existing five lane section of Northridge Road just west of Dunwoody Place, which would provide a consistent five lane section along Northridge Road.
The Northridge Road existing typical section consists of two 9.5-foot travel lanes in each direction with one 10-foot center left-turn lane, curb and gutter, and a 5-foot sidewalk. The width of the right-of-way (ROW) varies; it is 60 feet on the east side of SR 400, and 100 feet on the west side of SR 400. The existing bridge is a four-span, concrete deck and steel plate girder on concrete bent structure. The bridge is 289 feet long and 61 feet wide with a sidewalk on south side of the bridge. The sufficiency rating of the structure is 54.5. The proposed typical section would consist of four 11-foot travel lanes, one 11-foot center left-turn lane, 10-foot urban shoulders that include curb-and-gutter and a 5-foot sidewalk on the south shoulder, and an 11- foot auxiliary lane from SR 400 northbound to Dunwoody Place northbound. The proposed bridge is approximately 350 feet long and 90 feet wide. The proposed ROW will vary between 60 to 118 feet. The project will provide capacity and operational improvements to the SR 400 ramps at Northridge Road as well as the intersections of Northridge Road at Dunwoody Place and Roberts Drive.
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