The Eaton Place/Chain Bridge Road Intersection is a critical component of the regional transportation network; access ramps to I-66 are located on Route 123 just north of the intersection, and Route 123 traffic in this section will increase with the addition of the I-66 Express Lanes access points. The location is also the City’s northern gateway and connects users with the Northfax area, one of the City’s targeted redevelopment areas. Chain Bridge Road (Route 123) is a National Highway System (NHS) route and serves an ADT of 39,000 VPD. The intersection experiences significant congestion due to its current operation with eight signal phases (including four separate side street phases) to control movements at seven legs.
The city engaged a consulting engineer to evaluate multiple options for the roadway. The two primary concepts that were brought to the public for discussion and feedback were 1) displaced left turn 2) two lane roundabout
After further traffic analysis and public input the City advanced the roundabout option for funding consideration. This would replace the signalized intersection at Chain Bridge Road (Route 123) and Eaton Place with a two-lane roundabout.. The City performed an alternatives analysis to determine the optimal solution to improve mobility and safety at this intersection. A two-lane roundabout is the preferred solution, and will be effective at reducing congestion, consolidating access points to simplify operations, and reducing conflict points to improve safety. The two-lane roundabout will serve the traffic demand during the peak periods and eliminate the need for long waits at the signal at off peak times. In addition, by improving vehicle throughput, the project will improve transit operations through this area. The project will also incorporate bicycle and pedestrian crossings. The two-lane roundabout will have a 120' diameter center island, 20' truck apron and two 15' circulating lanes. The project will also include 5' sidewalks and a 10' wide shared use path to tie to the George Snyder Trail and I-66 trail.
After completion of the concept plan, the City applied for, and was awarded, $10.7M in funding for this project from the Northern Virginia Transportation Authority. However, the project requires additional funding in order to advance into preliminary engineering; the City is continuing to seek funding from VDOT and the NVTA for the funding.
- Concept planning: Complete
- Concept refinement and preliminary engineering: Pending award of additional funding