Flow map - Traffic Flow (Redmond Washington)http://redmondlibrary.blogspot.com/2009/09/redmond-traffic-cameras-and-traffic.html

http://redmondlibrary.blogspot.com/2009/09/redmond-traffic-cameras-and-traffic.html

The map above shows the traffic flow in Redmond, Washington, around 12 pm in the afternoon.  The green indicates areas that are free of congested traffic while the yellows and darker reds indicate areas that are relatively congested with traffic.  Maps like this are becoming more and more common for big cities.  Google maps now has the option to see traffic reports in this color scale form any time during the day.  Looking at this flow of "goods" can save you A LOT of time when you are travelling!