I was driving a California licensed car when I got the ticket but did not know it until I got home and saw my mail. Too late to go check the route for speed signs, and the cost of going back to protest is more than the. $250 fine. Got a speed violation in Scottsdale in 2001. Same situation--didn't know until returning home and the next year checked the route we traveled and there was no sign posting the speed limit in the section between where we entered the road (Camelback) and the point at which the ticket was issued. Out of state license plate again. Comments of most people I've told about the ticket: "You're from out of state and they know you won't be contesting it."