the Northern Virginia Regional Plan for 2000, completed in 1965, envisioned Outer Beltways in Fairfax and Prince William counties
Source: Northern Virginia Regional Planning and Economic Development Commission, Northern Virginia Regional Plan for 2000
in 1973, Prince William County still planned for construction of the Outer Beltway in Fairfax County and a Third Beltway in Prince William
Source: Prince William County Planning Department, Comprehensive Plan for Prince William County: A Framework for Action, 1973-1978 (Plate 9)