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Gainesville Interchange Project
I-66/Route 29 Gainesville Interchange
(Updated February 2014)
Alliance Position:
Upgrading the road network around the I-66/Route 29 Interchange in Gainesville is a longstanding Alliance priority.

Project Description:
The Gainesville Interchange Project consists of four phases. Click on the links below for more information on each phase.
  • Phase I - University Boulevard Connector - Completed August 2006
  • Phase II - Widening I-66 between Route 234 Business and the Route 234 Bypass - Completed November 2006
  • Phase III - Widening I-66 between Route 234 Bypass and Route 29 - Completed July 2010
  • Phase IV - Grade separating and widening the I-66/Route 29/Linton Hall Road Interchange. Route 29 is being widened to six lanes and driveways and two traffic signals are being eliminated between I-66 and Virginia Oaks Drive to create limited access faciliity between Virginia Oaks Drive and Heathcote Blvd.  Construction began in 2011. Project completion scheduled for June 2015. 

$435 million

Current Status:
 Phase IV construction is underway. New overpasses taking traffic over Norfolk Southern Railroad were completed in 2013 and are now open to traffic. Project scheduled for completion in June 2015.

For more information, click here.

 Located in one of Prince William County's fastest growing areas and as a major I-66 link from fast growing communities to the north, south and west, the I-66/Route 29 Gainesville Interchange has become one of Northern Virginia's largest transportation bottlenecks.

I-66 carries 87,000 vehicles a day between Route 29 and the Route 234 Bypass. The number of vehicles is expected to exceed 175,000 by 2028. Route 29 carries roughly 57,000 vehicles a day through Gainesville and is expected to increase to 87,000 by 2035.

This area is the economic engine for western Prince William County. Four new shopping centers are open and/or planned along with up to 10,000 approved homes that would generate tens of thousands of new daily trips.

Route 29 is the only road with four or more lanes going through the area and presently carries 64,000 vehicles per day according to VDOT. Normally a four-lane road can carry 50,000 vehicles per day. Route 29 through the area has at least three new traffic signals planned. The intersection of Route 29 and Route 15 will soon have a fourth approach added for a new residential community which will diminish the available green time for through traffic on Route 29. Peak hour traffic flow through the area has not increased in years simply because it is restrained by the gateway intersections. There is a plan to widen Route 29 to six-lanes, which will quickly be absorbed by latent traffic demand.

The exurban traffic demand on the Route 29 and I-66 corridors is growing daily with new communities in Culpeper, Fauquier, Frederick, Madison, Orange, Rappahannock, Shenandoah and Warren Counties. Collectively, there are in excess of 50,000 homes in the planning and construction stages of development in that corridor.