If we, as a society, are not willing to risk innocent lives to catch bank robbers or fleeing felons, why should we endure a similar risk simply to tax motorists who are often traveling at a speed which is entirely reasonable and appropriate for the conditions? Speed limits could still be enforced through cameras, automated devices, and the old Ohio Highway Patrol standby of having a cop call ahead to another cop up the road who waves the motorist over to receive a ticket. If this increases the cost of speeding enforcement, perhaps it will inspire municipalities, and the citizens of those municipalities, to more closely consider whether their police are best serving the public by serving as roadside tax collectors.
But who decides what speed is reasonable? I know people that would probably travel 100mph if they were allowed to and I feel at that speed no amount of reaction time would stop a fatality if someone were to pull out in front of them. If we did not have a limit then you know that more people than you like to admit would be doing speeds that would put us all at risk. Without enforcement of the limit it would be just as bad as not having a limit and people would do whatever speed they felt like doing putting everyone else on the road at risk. Look at the recent accidents from the idiots drag racing on 235, without enforcement people like this would be driving that way all the time and there would be a lot more of them.