Map of construction project districts


I-66 Corridor Improvements

Multimodal Improvements in Prince William, Fairfax

Area Maps

Project at a Glance

Begin Date
Tier 2 Environmental Study - July 2014

Lengths and Limits
I-495 in Fairfax to
Rt. 15 in Haymarket

Fairfax and Prince William

Northern Virginia

Susan Shaw, P.E.
Tier 2 Study Manager

VDOT and the Department of Rail and Public Transportation (DRPT) are working on a project to transform 25 miles of I-66 into a multimodal facility that moves traffic and people more efficiently, with improvements such as express lanes, rapid bus service and a park-and-ride network from the Capital Beltway to Haymarket. 

July 2014 kicked off 17 months of environmental study (the Tier 2 Environmental Assessment) and robust community involvement. By the end of 2016 the goal is to complete environmental work, identify funding sources, receive federal approval, and advance an innovative project delivery method so that construction could begin as early as 2017.  

For more project details, view the project kick-off meeting presentation and Governor's news release (July 17, 2014). 

Stay informed and participate: VDOT and DRPT will conduct thorough research and outreach along the corridor to understand local needs and issues, and to update residents and commuters on the project process. This webpage will be the focal point for information. Please visit often, attend information meetings, and send your questions and comments.

Tier 2 Environmental Assessment

Began: July 2014
Completion: Fall 2015

The Tier 2 Environmental Assessment scope includes a combination of concepts identified in the Tier 1: Two Express lanes, three regular lanes, rapid bus service, in addition to other safety and operational improvements. It will evaluate site-specific conditions and potential effects the proposed improvements would have on air quality, noise, neighborhoods, parks, recreation areas, historic properties, wetlands and streams. The proposed improvements will not preclude the addition of Metro, light rail or bus rapid transit within the right-of-way on I-66 in the future.

Tier 1 Environmental Impact Statement

Began: Summer 2011
Completed: November 2013

In Nov. 2013, the Federal Highway Administration approved the Tier 1 Environmental Impact Statement with a Record of Decision.

The Tier 1 EIS studied potential multimodal improvements that could address existing and future transportation needs in the I-66 corridor from the Beltway in Fairfax to Rt. 15 in Haymarket. The study was developed by VDOT, the Federal Highway Administration, and the Virginia Department of Rail and Public Transportation. 

A Tier 1 EIS differs from a traditional EIS in that it focuses on broad issues such as purpose and need, travel modes (bus, carpool, rail transit, car, etc.), technology choices, and the general location of proposed improvements.

Public meetings were held in June 2011, January and February 2012 to help gather input for the study's purpose and need statement. Public hearings in March 2013 focused on the Tier 1 Draft EIS, which entailed extensive traffic forecasting, analysis of how transportation modes work in combination with others, and evaluations of possible impact on natural and human environments.

During Tier 1, VDOT and the Department of Rail and Public Transportation (DRPT) identified ten concepts that would increase capacity, provide multi-modal options, improve individual interchanges, and address safety and operations.

Request for Information

In November 2013, 19 private-sector firms offered recommendations for solutions to improve Interstate 66 in response to an RFI issued by OTP3. The RFI sought innovative and creative solutions to ease the congested I-66 corridor from the Capital Beltway to Route 15 in Haymarket, with an emphasis on providing a multi-modal solution and minimizing right-of-way impacts. More information on the RFI is at

Other I-66 Projects

Other projects along the I-66 corridor in northern Virginia include an active traffic management system, a new Bus and HOV access ramp at Vienna Metro, widening from Gainesville to Haymarket, a new auxiliary lane inside the Beltway, and improvements at the Route 15 and 28 interchanges. See all VDOT projects along the I-66 corridor in Virginia.


Project Kick-off Meeting Presentation (July 17, 2014)
Information on the RFI:
All VDOT projects along the I-66 corridor in Virginia

Tier 1 Final Environmental Impact Statement and Record of Decision (12 MB) Nov. 20, 2013
Tier 1 Draft Environmental Impact Statement (EIS) (9 MB) Feb. 2013
EIS Transportation Technical Report Feb. 2013

Meeting Materials
January/Feburary 2014 - Public info meetings display boards
March 2013 - Public hearing presentation, brochure, and display boards (14 MB)
January/February 2012 - Public info meeting
presentation, newsletter, display boards, and comments summary
June 2011 - Public info meeting presentation,
handout, and display boards (18 MB)
Cooperating and participating agencies meetings - March 2012,  November 2011
Agency scoping meeting -
June 2011

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Page last modified: Aug. 21, 2014