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Google-enabled android cell phones is one of the primary sources of traffic data for traffic layer in Google Maps. If you use Google Maps for mobile with GPS enabled on your phone, then you're contributing the traffic data yourself. When you choose to enable Google Maps with My Location, your phone sends anonymous bits of data back to Google describing how fast you're moving and combined with thousands of other phones on the road tells Google where the congestion is by how fast cars are driving.

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11y ago

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