Hmmmmm. Reminds me of a
Locationless Geocache. Just require waymark visitors to get a speeding ticket and post it, now we've got the visit requirement handled.
Posting an active radar officer is the only way that I can think of to prevent abuse of the cat (people posting any old location). Of course, these people would need to wait until after they post bail to post a waymark
.
Another thing that's important to remember here: A few officers in Florida DO NOT represent the worldwide view of law enforcement officials. Go ahead, post a Speed Trap waymark in Chetzumal, Mexico if you're feeling brave.
I'm sure certain jurisdictions (like Florida) will be quite happy with having speed traps identified. I seem to recall Manitoba was cool with it too in my travels while places like Ontario and Alberta crack down on it. For example, you can be charged with an offence if you "flash your headlights" to warn oncoming traffic about a speed trap in Ontario. Even in Ontario, there are some counties that would encourage a category like this (Halton) while others would go out of their way to ruin your day because of it (Peel, Chatham-Kent).
As BQ stated earlier, most Canadian provinces outlaw speed trap warning devices and it won't take long for GPS with POI data to be included in that definition.
I do like the idea of identifying areas that localities 'trick' drivers -- things like the earlier mentioned speed change sign with a tree in front of it, or intersections where municipalities (often illegally) shorten yellow light timing to nab more people running red lights. It will be difficult for the officers to keep this category clear of useless garbage though.