From George Bush Houston Intercontinental Airport ( IAH )

Use the Airport South exit (towards I-45) to the Sam Houston Tollway (Beltway 8).
Take the tollway west (towards I-45).  Be prepared to pay three $1.25 tolls.
Exit the tollway at Westheimer Rd/Richmond Ave.
Turn left at the second stop light (Richmond Ave).
Drive under the tollway overpass.
IADC is in the first building on the left. Turn left and follow the signs for visitor parking.

From Houston Hobby Airport (HOU)

Take I-45 North (towards Dallas/Downtown Houston)
Stay on the freeway through downtown Houston & take the exit that puts you on I-10 West (towards San Antonio).
Continue on I-10 West to the Sam Houston Tollway (Beltway 8).
Take the tollway south. Be prepared to pay one $1.25 toll.
Exit the tollway at Westheimer Rd/Richmond Ave.
Turn left at the second stop light (Richmond Ave).
Drive under the tollway overpass.
IADC is in the first building on the left. Turn left and follow the signs for visitor parking.+

Click Here for Map and Personalized Driving Instructions