Google Maps shows real-time information about traffic for many US cities (like Kansas City, New York). To see this, switch to the map or hybrid mode and click on the new traffic tab. Google Maps will add a layer that colors the roads in green, yellow, red, or gray. The colors represent how fast the traffic is moving:

• Green: more than 50 miles per hour
• Yellow: 25 - 50 miles per hour
• Red: less than 25 miles per hour
• Gray: no data available

Until now, this feature was available only in the mobile client of Google Maps.

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Google, Google Maps, Navigation