VDOT pushes South‑Side 495 express lanes study, board presses on local impacts and Maryland coordination

VDOT presented an update on the I‑95/I‑495 South‑Side Express Lane NEPA study to the Fairfax County Board of Supervisors Transportation Committee, saying the project would add buffer‑separated express lanes on the western portion of an 11‑mile segment and transition to one express lane per direction eastward.

The project is in a NEPA study that began in 2022. VDOT’s presenter, identified in the transcript as Ms. Shropshire, said the team screened 10 alternatives and has carried forward two build alternatives plus a no‑build. She described the recommended preferred alternative as “two express lanes in each direction” on the western portion, tapering to a single express lane toward the Maryland (MD‑210) interchange, and noted federal agencies have provided concurrence on aspects of the preferred alternative as part of NEPA.

Why it matters: VDOT’s preliminary traffic modeling projects substantial future travel‑time improvements in a 2050 build condition and predicts “moving more people with fewer vehicles,” a phrasing the presenter used to describe increased carpool and bus ridership. The study also includes multimodal commitments — a proposed new bus service between Central West Prince George’s County, Md., and Tysons Corner, and a preservation of space on the Woodrow Wilson Bridge for a possible future heavy‑rail alignment. VDOT said commitments to transit, bike and pedestrian facilities and mitigation of local‑road effects will be documented in the NEPA record and later engineering and concession documents as the project scope is refined.

Board concerns and context: Supervisors repeatedly pressed VDOT on local‑road and arterial impacts, citing how congestion on the Beltway drives cut‑through traffic onto Telegraph Road, Van Dorn Street and other arterials. Chairman McKay framed the stakes tersely, saying the no‑build scenario would roughly “increase peak delays by an hour” and called the alternative unacceptable. He also described the project as an equity issue, saying he would “overlay this project against our 1 Fairfax equity policy and give it 5 stars” because prior private‑sector toll projects had excluded parts of the county.

VDOT’s response focused on experience from other managed‑lane corridors: the presenter said those projects tend to keep more vehicles on the mainline, increase carpools and bus usage, and reduce diversion to local arterials. VDOT cited initial modeling numbers — roughly 2,400 more people moved during peak hours in the modeled scenario and travel‑time improvements cited for 2050 (for example, the presenter described a modeled 109% faster westbound condition in one AMP scenario compared with no‑build) — and said a more detailed arterial analysis will follow the NEPA phase and be documented in subsequent traffic‑analysis and NEPA‑reevaluation steps.

Regional coordination and next steps: Multiple board members emphasized that Maryland’s participation is essential for success. The VDOT presentation asked the committee and regional partners to consider supporting the study’s inclusion in the metropolitan long‑range plan at an upcoming TPB vote; VDOT stressed that TPB inclusion is procedural and does not authorize construction. The presenter said public outreach has been extensive, including citizen information meetings and a June public hearing that yielded nearly 1,000 comments summarized in about 70 themes.

What comes next: VDOT will continue environmental analysis, refine the project scope and follow with more detailed traffic work that includes arterial and local‑road impacts. The committee did not take a formal vote; members asked staff and VDOT to continue refining impacts, coordinate with Maryland and to bring the project forward for regional consideration at the TPB as the study advances.