<Tr> <Th> Current status </Th> <Td> Active </Td> </Tr> <P> Google Traffic is a feature on Google Maps that displays traffic conditions in real time on major roads and highways . Google Traffic can be viewed at the Google Maps website, or by using the Google Maps application on a handheld device . </P> <P> Google Traffic works by analyzing the GPS - determined locations transmitted to Google by a large number of mobile phone users . By calculating the speed of users along a length of road, Google is able to generate a live traffic map . Google processes the incoming raw data about mobile phone device locations, and then excludes anomalies such as a postal vehicle that makes frequent stops . When a threshold of users in a particular area is noted, the overlay along roads and highways on the Google map changes color . </P> <P> Early versions of Google Maps provided information to users about how long it would take to travel a particular road in heavy traffic conditions . Traffic information was based on historical traffic data and was not particularly accurate . </P>

Where does google maps get traffic data from