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Waze uses data from app users to provide quicker navigation routes. Data is submitted both automatically as users drive around (using speeds determined by GPS signals) and can be manually entered on the app. Users can report speed traps, accidents, traffic jams, and other things that could slow down drivers.
Yeah there's an icon you select when you're driving to report thing like cops, road hazards, etc.
Waze is great but can't fully replace a radar detector. Waze only works when the cops are parked. If they are running radar while driving, you're vulnerable.