You are invited to become a member of the American Expressway, one of the newest and most innovative road systems in America. There are many advantages to the American Expressway over the standard tollways, parkways, highways and freeways but by far the biggest advantage is:
Instead your personal speed limit is determined by your vehicle, your personal resourcefulness and your past speeding patterns. When you enter the expressway your personal ID number is transmitted to Central Control to tabulate your tolls and record your initial speed (all AE members may travel at 55 with no restrictions). If you decide to pursue a greater speed then an authorization will be sent to Central Control and our highly specialized, non deterministic and little understood AI algorithm will decide if you are approved for your new speed. If you are not then a Service Technician (formally known as a State Trooper) may stop you to ask a few questions to verify that you were capable of handling your new limit (Do you increase throttle to induce oversteer in a decreasing radius turn?), that you have adequate resources (Is that a Crosley Wombat V16?) and that you are not too far out of your previous speeding pattern (Have you ever driven at 180 mph before?).
To apply for membership call 1 800 HAUL ASS
[Ed: You can read about an effort by American Express to get this joke deleted on the Brad ideas blog.]