Dunn Loring Metro: Traffic Impact Study, Vehicle Trip Reduction | Wells + Associates

Wood Street

Traffic Study Shows that Metro Redevelopment Will Reduce Vehicle Trips to the Site, Even with Increased Demand

Dunn Loring Metro, LLC is helping reshape the Merrifield Suburban Center into a transit-oriented development. In 2006, the Fairfax County Board of Supervisors agreed to rezone a 13.4 acre parcel consolidation at the busy Dunn Loring-Merrifield Metro station. The redevelopment will include 125,000 gross square feet of retail space and 650 multifamily units. Located in the immediate vicinity of I-66, the Capital Beltway, Gallows Road, and Prosperity Avenue, the site also features expanded transit facilities that will improve transit options for residents and visitors, including bus bays, kiss-and-ride, and a 2,000 space park-and-ride Metro garage.

Demand outpaced the previous configuration. The site had been occupied by 1,355 Metrorail park-and-ride spaces, six bus bays, and a 36-space kiss-and-ride – all located on surface lots.

W+A traffic engineers in Virginia were retained by Dunn Loring Metro to evaluate the transportation impacts of this project. A traffic impact study was performed using the latest trip generation data available, as well as two different capacity models.

We determined that the proposed mix of uses, transit connectivity, trip mitigation measures, and a pedestrian-friendly environment will reduce the number of peak hour vehicle trips generated by this development, while taking direct advantage of the expanded transit opportunities.

W+A’s work demonstrated that the full development of the Dunn Loring Metro project will achieve the balanced transportation network envisioned in the Comprehensive Plan. It will do this by providing better vehicular mobility, along with enhanced pedestrian, bicycle, and transit facilities within an increasingly urban framework. Our recommendations included intersection improvements, signal modifications, and a state-of-the-art Transportation Demand Management (TDM) program designed to encourage natural and viable alternatives to driving.

W+A continues to be instrumental in the ongoing evolution of this project, as the site implements its TDM program and further refines its parking needs.​