Va., Feds Reach Deal to Finish Fairfax County Parkway – WTOP
After about fifty years of planning and twenty years after the initial segmant opened, the Fairfax County Parkway remains incomplete, but progess has been made to finish the road.

SPRINGFIELD, Va. (AP) – Virginia has reached an agreement with the Army and the Federal Highway Administration to complete the final section of the Fairfax County Parkway.

Much of the two-mile section from Rolling Road to Fullerton Road is located within the Fort Belvoir Engineering Proving Ground.

Unfortunately, the price of
this stretch of road has increased by over $100 million in the last ten years, according to The Wash. Examiner.

Here is the VDOT Web site. A pretty thorough history can be found at Roads to the Future.