In France, some users use the "coyote" system.
it is a non-free systems that permits to alert on dangers on roads, traffic and so on.
Because exact localisation of police is forbidden, Coyote only alerts on danger area...
Now, we can find speed camera that calculate the average speed on a portion of road.
On Coyote, the system indicates in big on the screen (when the app is on phone device) the actual speed and the upper maximum speed you can reach if you want to be below the average limit.
On Waze, we need to declare the first police trap and the last one. After validation on the map, Waze will know the distance between the 2 points, and the speed limit.
Waze will be able to calculate the average speed of the car in real time between the 2 points and display the necessary informations on the screen.
I think it is urgent now that Waze takes in consideration these new kinds of police trap... France will have many of them in a near future.
France - French - Galaxy S3 - Android Version 4.1.2 - Stock ROM
Translator for french language - "Localization expert"