My speedometer has the same function - it also has the ability to display lower speeds when conditions make it unsafe to dogmatically travel at the speed limit.
I no longer speed intentionally, ie I sometimes make mistakes, but I'm not holier than though as I used to routinely speed by using speed limit + 30 mph + speedo error as my target speed but not fast enough to lose my licence.
My point is that every car has a speedometer, there's simply no need for extra technology.
Edited by RT on 27/03/2011 at 21:25
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