Take the No Love for Litter Pledge

Overnight Full Closure of I-66 East and West at Route 123, May 7-8, for Bridge Beam Installation. Learn more.

About the Project


The Virginia Department of Transportation (VDOT) and its private partner, I-66 Express Mobility Partners (I-66 EMP), are working closely with Fairfax and Prince William counties, bike advocacy groups, homeowners associations and local residents to advance the design of planned trail facilities as part of the overall Transform 66 Outside the Beltway Project.  In addition to providing trails and connections on reconstructed roadways that cross I-66, a high-value trail is being developed in the physically-constrained I-66 corridor.

VDOT developed the concept plan for the I-66 Trail consistent with local jurisdiction trail plans. During earlier public outreach for the project, VDOT received many comments opposed to placing the trail on the residential side of noise barriers in locations where the trail passes near homes. Those comments led to a contract requirement to locate the trail on the highway side of noise barriers in areas adjacent to homes.

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I-66 Trail Plans

Conceptual Trail Plan:

Click the trail map above to enlarge

In coordination with Prince William County, a future trail to be constructed by others has been proposed on parallel roadways.  Two segments of this trail adjacent to proposed park and ride lots at University Boulevard and along Balls Ford Road will be constructed as part of the Transform 66 project.

Between Route 29 in Centreville and Gallows Road, the current concept plans show approximately three miles of trail adjacent to the interstate and approximately eight miles of trail behind the noise barrier or with no noise barrier.

Click the trail map above to enlarge

The bike trail will be 10-feet wide, with a two-foot-wide shoulder on each side, in accordance with VDOT standards. In certain space-constrained locations, the trail width may be reduced to eight feet, with shoulders.

Access to the trail will be provided about every half-mile. The 66 project team is working with Fairfax and Prince William counties to identify the best location of each access point. Preliminary access points for the trail between Route 29 and Gallows Road are shown by green arrows in the Conceptual Trail Plan (see above map).

Bridge Crossings

New bridges over I-66 will better accommodate cyclists and pedestrians, while connecting existing and planned bike routes. Two sample cross sections are shown here.

Cross Section of the Proposed Bridges on 1) Jermantown Road and 2) Gallows Road



Next Steps

Working with the public and key stakeholders, our goal is to create a trail environment that invites cyclist and pedestrian usage and contributes to the “move more people not more cars” mission of the Transform 66 project. Trail design features including the trail alignment and connections along the corridor were included in the overall project design plans at public hearings held in November 2017. 

Temporary Realignment of W&OD Trail at Idylwood Park in Use Until About June 2021

The Washington & Old Dominion Trail (W&OD Trail) near Idylwood Park (between Virginia Lane and the trail bridge over I-495) in Falls Church has been temporarily shifted toward I-66 to accommodate construction of a retaining wall needed for new Express Lanes ramps. This temporary alignment is expected to be in use until around June 2021, at which point the trail will be shifted to its post-project alignment closer to Idylwood Park. 

The W&OD Trail adjacent to Idlywood Park in Falls Church has been temporarily realigned until around June 2021. The temporary trail will be located slightly south of the current trail alignment adjacent to I-66 West.

Typical cross section of the temporary realignment of the W&OD Trail at Idylwood Park. The trail will be shifted slightly to the south of the current alignment. 

Trail and Sidewalk Closures

Some construction activities will require trails and sidewalks in the project corridor to be closed for varying periods. This includes trails along the corridor as well as bridges and underpasses that cross I-66. Providing safe alternate routes is a priority for the project team. Detours will be clearly marked to help pedestrians, cyclists, and others remain mobile.

Sidewalk closures will alternate sides during construction of new bridge. Follow signs.

Current Trail and Sidewalk Closures (Updated April 16, 2021)
Vaden Drive over I-66 (also the W&OD/City of Fairfax Connector Trail) - Vienna
Through mid-2021 Shared-use path is open on the east side. Sidewalk on the west side is planned to open in mid-2021.
W&OD Trail near Idylwood Park
Through June 2021
The trail has been shifted slightly toward I-66 to allow construction activity.
Jermantown Road north of I-66 - Oakton
Through 2021
Sidewalk on west side near Phoenix Drive is closed for construction. Use opposite side.
Waples Mill Road over I-66 - Oakton
Through mid-2021
Sidewalk closures will alternate sides during construction of new bridge. Follow signs.
Bobann Trail along I-66 East - Centreville
Through 2021
Trail will periodically be closed for I-66 construction. Detours use Centreville Farms Road, Leland Road, and Pickwick Road.
University Boulevard over I-66 - Gainesville
Through 2022
Sidewalk on east side is closed for construction of Express Lanes ramps. Separate path has been created along northbound University Boulevard.
Cedar Lane over I-66 - Vienna
Through Spring 2021
Cedar Lane Bridge opened in December 2020. Concrete for the shared-use path connections to the bridge is planned for Spring 2021.
Gallows Road over I-66 – Dunn Loring
Through 2022
Sidewalk closures will alternate sides during bridge construction. Follow signs.


Trail Map – Fairfax County 
Trail Map – Prince William County
Presentation to Fairfax Alliance for Better Bicycling (Feb. 28, 2019) - PDF 23MB