Love this one...this will be great on car trips.Show traffic conditions: Open Maps, press the dog-eared page icon in the lower right, and then turn the Traffic overlay on. If your iPad has an Internet connection, Maps will show real-time traffic conditions in the displayed area. Green means traffic is going at the posted speed limit, yellow means traffic is slower than the posted speed limit, and red means traffic is stop-and-go.
Can someone tell me how these traffic conditions are measured?