Directions From the East/Washington: Take the Toll Road (267) West to Exit 14 Hunter Mill Road. After exiting the toll booth, turn left on to Hunter Mill Road, go under the overpass, and take the first right onto Sunrise Valley Drive. Take the third right onto Alexander Bell Drive. ASCE is the first office building on the right. From the West/Dulles Airport: Take the Toll Road (267) East to Exit 14 Hunter Mill Road. After exiting, go right on to Hunter Mill Road, then take the first right on Sunrise Valley Drive. Take the third right onto Alexander Bell Drive. ASCE is the first office building on the right.