sorry to disappoint all those who think the cop was just doing his job, but if you stop to consider the purpose for speeding tickets, which is revenue, then his JOB doesn't seem so purposeful...
as much as everyone would like to think that speed limits are a measure of safety, we all know they are set well lower than they should be in many places, and the primary reason is money. same goes for red light cameras. they aren't there for safety, but as revenue generators. case in point: dallas county. they have removed red light cameras from all intersections which have proven not to be financially beneficial. the incidence of serious accident resulting from those running red lights had gone down significantly at each of the locations, but because of that, the city did not make enough money as a result of them being there...
speed limits are the same... they are purposefully kept at the low standards set during the gas crisis of the 1970's in order to generate revenue. its just another way to tax individuals (although cops seem to think they are exempt at all times, although they should watch out in the future:
Montgomery's Finest Won't Pay Fines - washingtonpost.com)