How Does Google Detect Traffic Congestion? | Chron.com
Following the introduction of Google Maps and Google Earth in 2005, Google soon became interested in providing real-time traffic information to its customers. However, with 3.9 million miles of public roads etched into the U.S. landscape, keeping tabs on all of the country's traffic activity 24 hours a day proved to be a pretty tall order -- even for one of the most omnipresent companies in the digital age. Still, Google has managed to pull it off ... with a little outside help.
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