Start out going NORTHEAST on SAARINEN CIR toward DULLES AIRPORT ACCESS RD. Stay STRAIGHT to go onto DULLES AIRPORT ACCESS RD. Merge onto VA-267 E toward I-495/EXIT 18-19/VA-123/BALTIMORE/RICHMOND (Portions toll). Merge onto I-495 S/CAPITAL BELTWAY via EXIT 18 toward RICHMOND. Take EXIT 57A toward I-95 S/RICHMOND. Take EXIT 169B toward VA-644 W/OLD KEENE MILL RD/SPRINGFIELD. Take EXIT 169A-B toward VA-644 E/FRANCONIA/VA-644 W/SPRINGFIELD. Take the VA-644 W/OLD KEENE MILL RD exit, EXIT 169B, toward SPRINGFIELD. Stay STRAIGHT to go onto BACKLICK RD. End at 6412 Backlick Rd Springfield, VA 22150-2633.