RESEARCH - Safer speeds: an evaluation of public education materials
Choosing the speed to drive at on our highways is a highly controversial and individual decision. I would dare to say that the posted speed limit is only a guide for many drivers. For those drivers, the choice ranges from total disregard to the point that you decide what is 10 over from.

Mr. Victor Shymanski was charged with disobeying a traffic control device after he drove his commercial vehicle past a regulatory sign requiring him to stop and check his brakes. He was convicted at trial.