From Interstate 35

Take exit 252B, Ranch Road 620, and head west. This is a left hand turn coming North from San Antonio/Austin, and a right hand turn coming South from Dallas/Georgetown. Proceed 4 miles on 620. When you pass the Round Rock Skating Rink (on left), you're getting close. Road turns left and comes to a stop light just in front of the Toll 45 bridge. Turn right at light, following signs for 620 West. Continue to second driveway on right, just before landscaping place, turn right. Proceed down dirt road and you'll see N-Control.

This alternative is recommended from points south along IH35, toll cost is $0.75 and the route is quite a bit faster. Using Toll 45 from IH35 and points east, take Toll 45 West, exit for 620. At base of ramp, continue straight through traffic light. Continue to second driveway on right, just before landscaping place, turn right. Proceed down dirt road and you'll see N-Control.

From Highway 183 and Parmer Lane

Take RR 620 heading east, or the eastbound 620 access from Parmer Lane. This is a right hand turn coming North from Austin, and a left hand turn coming South from Leander/western Round Rock. Approach Toll 45 underpass and move to far left. Use the "U-Turn" lane to enter 620 Westbound, move immediately to far right lane. Continue to second driveway on right, just past small used car lot, turn right. Proceed down dirt road and you'll see N-Control.