Realtime speedtrap map

Speed camera Google Maps mashups exist, but they are usually for known commonly used speedtraps or speed/redlight cameras. I would love it if there was a "smart" radar detector that contained a GPS receiver and is networked, could update a database in real time to indicate where the cops are RIGHT NOW. A user could then use a smart device or laptop and access a service that uses one of the mapping services to pinpoint where the speedtraps currently are.

In my experience, existing speedtrap data rarely proves useful...the cops have to actually be at the known location and looking for speeders for the information to be useful. Think of it like the Dash navigation computer, but for speeders.