Google announced they've expanded their traffic data to over 130 smaller cities across the world.
The expansion is not just in the US, but also in places like Colombia, Costa Rica, and Panama. Google also added cities in the US such as Kalamazoo (Michigan), Portland (Maine), Tuscaloosa (Alabama) .
Personally, I love Google Maps traffic and with Apple Maps replacing Google Maps in iOS 6, despite Apple Maps having real time traffic, I am a bit nervous about it's accuracy. I love being able to see how much longer that red line in Google Maps is when sitting in bumper to bumper traffic in New York. So expanding Google Maps real time traffic to more and more cities is great!
As you know, Google Maps crowdsources most of the traffic data, so it is pretty good.
Here is a coverage map of traffic data covered by Google Maps.