From I-495/Capital Beltway;
Take Exit 12,(Rt 267 West, Dulles Toll Rd) to
Rt 28/Exit 9A Sully Road.
Go south on Rt 28 to Willard Rd,
turn left and take second left to Expo Center.

From I-66;
take Exit 53 (Rt 28, Centreville/Dulles Airport)
and turn right at light heading north;
turn right at Willard Rd and take second left to Expo Center.