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"You might remember that, once upon a time, Google Maps offered you two estimates for your travel time -- ideal and in traffic. The problem was, Big G's estimates weren't so great. So, the web giant quietly removed the feature last year and simply started providing traffic-free travel times. Well, trip times in traffic are back, and this time Google promises their guess work won't suck. Using both live and historic traffic data Google Maps now offers an estimate of how long your trip will take in current conditions, directly under the congestion-free time. And, if you find the live traffic info in your area isn't particularly accurate, you can help improve that by turning on My Location in the Maps for Android app."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2012/03/29/travel-in-traffic-estimates-return-to-google-maps-promises-not/>