Most of us having grown up with speed limits don't know any different. It's just one of those things. Those of us who do like to push things every once in awhile use radar detectors. The police favorite weapon in revenue gathering....I mean speed enforcement. One of the best is the Valentine One. It has directional arrows pointing to the Bastard......I mean officer. With the amount of traffic on most roads these days it's difficult to open it up anyhow. At least around here. I know there are some areas of the country that are wide open.
Disclaimer: Any disparaging remarks made above were made only in fun and not necessarily those of this poster.