I call it "situational speeding" where the amount of speeding is relative to the situation. There will be areas where no amount of speed is acceptible and others where 20mph+ is not dangerous. This was the standard that I applied as City Court Traffic Judge and Attorney. The cops were really concerned when I got appointed because they knew that I was a fast car freak. They found real quickly that while there were some tickets that I tossed because I felt that the cop had crossed the line, most tickets were upheld if the public interest was being protected ie school zones, dangerous intersections, high traffic areas. I did not like tickets given where there was no traffic, visibility was good and there was no extreme behavior.