With real-time traffic, your navigation system can make sure your route includes the right side of this freeway situation. The system receives data from metropolitan areas and displays the traffic on the map if you choose. The system can re-route you automatically as needed, determining if sitting in traffic is still the fastest route, or if an alternate route will be better. The traffic info isn't available for all areas, but most places that have significant traffic will have this data. We've used it in Chicago, Detroit, Los Angeles, New York and parts of New Jersey, and found it to be extremely useful.