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Google has rolled out an updated version of Google Maps (http://googleblog.blogspot.com/2011/03/youve-got-better-things-to-do-than-wait.html) for Android which doesn’t just show you live traffic information for free… it can automatically reroute your directions to avoid congested areas.
Earlier versions of Google Maps would generally attempt to pick the fastest route from point A to B… but it didn’t take traffic conditions into account. And as anyone who’s ever tried to drive in a major metropolitan area during rush hour can tell you, sometimes a straight line is not the fastest way between two points.
The app will also look at historical traffic data, which should help if current conditions aren’t available, or if there’s congestion right now but it’s likely to clear up shortly.
Google Maps 5.2.1 is available as a free download (http://market.android.com/details?id=com.google.android.apps.maps) from the Android Market. The app supports Android 1.6 and up.