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I-66 and Route 15 Interchange Reconstruction

Constructing a new interchange in Prince William County

Project at a Glance

Begin Date
Early 2015

Est Completion Date
August 2017

$56 million

Lane Construction Corp.

Prince William

Northern Virginia

Christiana Briganti-Dunn, P.E.
Design Build Manager
Andy Carper (ATCS)
Construction Manager
Shirlene Cleveland, P.E.
Program Manager for Design Build Projects

About the Project

On May 14, 2014 the CTB awarded a $36 million contract to Lane Construction Corp. of Chantilly to design and build a diverging-diamond interchange (DDI) on U.S. 15 at I-66 to relieve congestion, enhance public safety, operations and capacity, and accommodate forecasted traffic demand in the area.

Diverging-diamond interchanges shift vehicles to the opposite side of the road and eliminate left turns that cross into oncoming traffic, improving safety. Traffic signals at each end of the interchange feature only two phases, reducing “red light” time for motorists and enhancing mobility. VDOT recently completed its first DDI on U.S. 15 where it crosses Interstate 64 at Zion Crossroads in Louisa County and has two more in the works in Roanoke and Blacksburg.

As part of this diverging-diamond interchange, the project will include constructing:

• Two longer bridges to carry U.S. 15 over I-66 with two crossover intersections;

• Ramp improvements (including a spur ramp to ease traffic flow from westbound I-66 to northbound U.S. 15 to westbound Heathcote Boulevard);

• Improvements on U.S. 15 from just north of the railroad tracks to just south of Heathcote Boulevard;

• Wider intersections on U.S. 15 at Heathcote Boulevard and Route 55, adding turn lanes to both; and

• A 10-foot-wide shared-use path on the east side of U.S. 15 for pedestrians and bicyclists.

The project also includes improvements to the Rte.15 intersections at Heathcote Boulevard and Route 55, and a shared-use path along the eastern side of Rte. 15.

Preliminary designs for the project included a Semi-Directional Ramp concept (See the project brochure from the March 20 2013 Public Hearing). The project was advertised for Design-Build delivery on September 24, 2013 and Design-Build teams had the option to offer alternate designs that address the project’s purpose and need. VDOT evaluated proposals for short-listed firms, based on technical and cost considerations. The concept proposed by the successful Design-Build team, Lane Construction/RDA, is the Diverging-Diamond interchange.  

Project cost

Preliminary engineering - $3 million
Right of way acquisition, relocation assistance and utility relocation - $6 million
Construction - $47 million
Total - $56 million

This project will be financed with federal and state funds. Costs are subject to change since project development is in the design stage.

Project Schedule

  • Public hearing on preliminary design - Spring 2013
  • Advertise project (Request for Proposals) - September 24, 2013
  • Commonwealth Transportation Board project award - May 14, 2014
  • Begin construction - Early 2015
  • Complete construction - August 2017

Other Resources


Contract Award (May 15, 2014)
Public hearing brochure and comment summary (March 20, 2013) 
Information meeting brochure (March 22, 2012)

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Page last modified: Sept. 11, 2014