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From Washington, D.C.
Cross into Virginia on the Roosevelt Bridge at the end of Constitution Avenue and take Route 66 West to the exit for the Dulles Airport Access Road and the Route 267 Toll Road. There is a toll to enter the Toll Road. Follow Toll Road to exit 14 at Hunter Mill Road. There is a toll to exit.
Coming off the exit ramp, turn left onto Hunter Mill Road. At the second stop light (a T-intersection), turn right onto Sunrise Valley Drive, go less then half a mile and through one stop light; after you go through the stop light you will go less than one-tenth of a mile to your first right onto Preston White Drive. Turn right at a sign marking The Branches office park. NPES is the first building on the right.
NOTE: Route 66 westbound inside of Route 495 is limited to use by cars carrying at least two people from 4 to 6:30 p.m.
Alternative route from downtown
Cross into Virginia on the Roosevelt Bridge or Key Bridge (leaving Georgetown), and take the George Washington Parkway north to the Beltway (Route 495). Take 495 South (the entrance bearing left from the Parkway) to the exit for Dulles Access Road and Route 267 Toll Road and proceed as above.
From Dulles Airport (Virginia)
Reston is approximately a 10-minute drive from Dulles Airport.
Take Dulles Access Road toward Washington, go approximately 2.3 miles; merge onto the Dulles Toll Road via Exit 12-13-14 toward Reston Parkway/Wiehle Avenue/Hunter Mill Road. Once on the Dulles Toll Road, take EXIT 13-Wiehle Avenue. Exit right onto Wiehle, then take next left at T-intersection stoplight onto Sunrise Valley Drive. Go seven-tenths of a mile, through two stop lights, and turn left into Preston White Drive at a sign marking The Branches office park. NPES is the first building on the right.
From National Airport (Washington, D.C.)
Reston is approximately 30 to 45 minutes from National Airport.
Upon exiting from the airport, follow signs to George Washington Parkway north, and take the Parkway north either to Route 495 or to Route 66 and follow directions given above.