Fordham at Columbia as a Grade-Separated Intersection Multimodal NC-54 Meeting April 6, 2017 Fordham at Columbia as a Grade-Separated Intersection Joe Hummer, Staff Engineer, Mobility and Safety

Current Diamond Interchange

Improvement Opportunities Pedestrians Congestion Speed control Progression

Grade-Separated Intersection Idea Sometimes junctions need a bridge If we build a bridge, we may not need or want a complete interchange Grade separated intersections = intersections with bridges All movements signalized Efficient two-phase two-approach (half) signals Encourage peds and bikes Allow four-way progression Control speeds

Concept—Replace Two Three-Phase Full Signals with Six Two-Phase Half Signals Columbia Fordham

Left Turns From Fordham to Columbia

East Intersection

North Intersection

West Intersection

South Intersection

Progression through all N-S signals Congestion relief Potential Progression through all N-S signals Congestion relief Pedestrian crossing simplified with less delay Two phase instead of three-phase signals Speed control on Fordham Need traffic control devices Need a little pavement Should be no extra ROW, no utility impact, minimal grading

Future Work Need traffic count, forecast Quick traffic analysis to see if concept feasible If feasible, more detailed traffic analysis Consultations Design Construct Document effects Look for other places to make similar conversion

Thank You! Joe Hummer, jehummer@ncdot.gov, 919-814-5102