Because your phone is basically a tiny traffic sensor.
Google Maps doesn’t “see” traffic, it measures behavior. Thousands of phones on the same road continuously send anonymized GPS location and speed data. The system groups these signals by road segments and compares current speeds with historical patterns. When vehicles suddenly slow down, like from 60 km/h to 10 km/h, it flags congestion and turns the road red in real time.
Then comes Waze. After Google acquired it, the real power was in combining data, not merging apps. Waze users actively report accidents, police, closures, and hazards, and that information flows directly into Google Maps. In return, Google’s massive data improves Waze’s routing and traffic predictions.
So even if you never open Google Maps, your phone can still be contributing to traffic detection.
You’re not just using the map. You are the map.
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