Google Maps have launched real time traffic updates in 30 major US cities, as Google continues with their approach of looking to be the application of choice on multiple platforms."According to Google product manager Carl Sjogreen, the data is aggregated from several sources, including road sensors, as well as car and taxi fleets.
As a result, Sjogreen said, there is sometimes not enough data to report road conditions. In that case, the roads appear gray.
For the time being, he added, Google will provide traffic data only for major highways, but it may expand the offering eventually."
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