Get a load of this new traffic interchange, coming to Haymarket

Interchange photoVDOT Photo

A traffic interchange that shifts cars from the right to the left side of the road and then back again is in the works where I-66 and Route 15 meet in Prince William County.

It’s called a diverging-diamond and it shifts vehicles to the opposite side of the road to eliminate left turns that cross into oncoming traffic.  That, say traffic engineers, improves safety. Traffic signals at each end of the interchange feature only two phases, reducing “red light” time for motorists and enhancing mobility.


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.

Virginia currently has two diverging-diamond interchanges, one in Louisa and another in Roanoke.   Two more in the works in Blacksburg and Stafford.

VDOT will be holding meetings about the Haymarket interchange on Wednesday, Dec. 7 and Tuesday, Dec.13 in the Bull Run Middle School cafeteria, 6308 Catharpin Road, Gainesville, VA. Both meetings start at 6:30 p.m. and feature a brief presentation at 7 p.m. and an interactive DDI walk-through.

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Ed Tobias
Ed Tobias brings more than four decades of reporting and news management experience to his work at FairfaxNews. Tobias managed news coverage for Associated Press Radio for over twenty years.  This included coverage of the 9/11 attacks, the Iraq War, Hurricane Katrina, the death of Princess Diana, the Challenger and Columbia shuttle disasters and national election primaries, conventions and campaigns.  He was part of the team that built AP’s on-line video operation. Prior to joining AP, Tobias was News Director at all-news WTOP in Washington, D.C. He has won two Ohio State Awards for his reporting and producing and he led coverage that won an Edward R. Murrow Award.