Riggs Road and South Dakota Avenue Intersection

Project Photos

Location: Washington, DC
Client: District Department of Transportation (DDOT)

The old intersection of Riggs Road and South Dakota Avenue was a semi-rural ramp system featuring multiple dangerous conditions for both vehicular and pedestrian traffic. The client’s design goal was to improve traffic flow and reduce accidents while enhancing pedestrian/bicycle activity and safety. Volkert conducted alternative studies involving traffic and utility data collection including pedestrian and vehicular turning movements, traffic forecasting, Synchro modeling to evaluate multiple scenarios, and three intersection design alternatives.

To create a more efficient and pedestrian-friendly intersection, the four-legged signalized intersection design included multiple greenspaces, preservation of mature trees, wider sidewalks with landscape buffers, ADA-compliant curb-ramps, crosswalks with pedestrian signal indicators , bulbouts for traffic calming, and designated bus stop areas.

Part of the effort also included coordination for utility work to accommodate a new 20 acre private redevelopment within the project area. This involved the relocation of a four-foot diameter to a six-foot diameter culvert, storm sewer, gas, water lines, and vehicular access into the future site.

Scope of Work: Site Survey, Geotechnical Study, Civil Engineering, Lighting Design, Roadway Design, Traffic Management, Stormwater Management, Utility Relocation, Landscape Architecture, Public Outreach