Why not also create an index and mark where Red light and Speed Cameras are perminatly set up. It will give an audible "Red Light Camera ahead" or "Speed Camera ahead, speed is 45 mph on this road" The user should have the ability to add or delete a camera if it has been removed.
It would enhance SA of one could enter waypoint names into a form of some kind. i.e. Known Speed trap or traffic camera come to mind, but I'm sure there are others. POI Factory and Discovery Owners (I'm sure there are others) have many specialized files available for down load. This function would allow setting the time to alert like "next turn" does now.