Originally Posted by
GraphiteGhost
Find a long straight road and set cruise control to 60mph. Time one mile, it should read one mile per minute. If you time it for 5 minutes, it will give you a much closer reading of actual speed (the more miles/minutes the more accurate). Make sure you set CC right at 60 and don't do it on a hilly or twisty road. Good luck!
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If there is a downhill slope then the car will speed up no matter what the speed you set it at. If the speed limit was 80mph them the ticket is not justified even on a flat road, but if the limit was less than your setting of 78 I guess you do. What was the speed limit anyway?
Pay up of fight it in court.