In a message dated 2/19/2006 10:42:47 P.M. Eastern Standard Time,  
samandgreg@netins.net writes:
IMHO, if  you try to make absolute limits of some kind, then you need a 
positive way  to enforce it.  The only way I can think of would be to 
require that  radar be used by a certified operator.  You would also need  
calibration requirements for the equipment.
A great way to look at course speeds is with a GPS data logger.  You  can get 
uber accurate MPH readings every 1/100th of a second tied to a course  map.
 
Stan
 
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