The airport signs are accurate, but if you're in the wrong lane when you see the sign, it's too late. More information about local roads can be found through the Missouri Dept of Transportation. If you're headed out of town and aren't lucky enough to have a friend or relative seeing you off, you'll want to park your car in a long-term parking lot. Lambert operates a long-term lot on this road. Note the letter of the lot A or B and the letter of the row in which you parked.
Shuttles run from the lots to the terminals and back every five minutes or so.
If you desire to print these maps out, download an Adobe Acrobat PDF file of these maps now.