Not very.
Over short distances maybe.
Of course you could simplify it, use sensors only located in areas where the speed limit is constant between the two, like most urban areas. Or motorways and many trunk roads.
For anything more you need an accurate database or mapping of speed limits, does such exist? And LOTS of processing power, given the volumes of data and the almost infinite permutations.
However, an effective system only needs to know the minimum time for legal travel on the shortest route between the two sensors.
Posted: 17/04/2008 at 13:14