Police helicopter or drone alarm nearby.
In some countries the police use speed radars installed on helicopters or drones. The idea is simple, when a wazer reports that warning it reaches drivers within 15 or 20 kilometers of that report. This would contribute to safer driving.
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IVAN ČABRAJA commented
I would like to suggest adding an option for "Police Drone/Radar" on the road, as they are becoming increasingly common, yet there is currently no way to report them. For instance, a 500-meter radius alert could encourage drivers to be more careful, fasten their seatbelts, slow down, and avoid overtaking.