As the only interstate highway running east-west between Washington, D.C., and northern Virginia, I-66 is a heavily traveled commuter thoroughfare. The Virginia Department of Transportation (VDOT) has overseen ambitious improvements to relieve congestion through the years, including a recently completed, four-phase improvement program to increase capacity and improve traffic flow on I-66 and Rte. 29 in western Prince William County. The phased improvements culminated with the completion of the I-66/Rte. 29/Linton Hall interchange and railroad grade separation project, which was designed by Dewberry under a design-bid-build contract to VDOT.
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