Interstate 66, which extends 75 miles from Strasburg to Washington, D.C., is the first multimodal highway in Virginia. It lets commuters integrate Metrorail and vehicle travel. It was completed in 1982.
A 10-mile segment of I-66 outside Washington, D.C., was the first major interstate to be built under the Environmental Policy Act of 1969. That legislation changed the way designers, right-of-way agents and contractors build highways.