Traffic Updates RSS in Barcelona and Elsewhere?

So the question came up yesterday on this thread whether anybody knew of a reliable RSS feed for traffic updates in Barcelona. Since that was in the Main Group I though we should end the thread there and restart it here in Discussions.

And I decided to go one step further and open it up as a general question for everyone everywhere: what is the best source for traffic updates in RSS for your city or country?

If we can figure that out for a lot of countries other than the U.S., we can get DIYtraffic up and running in lots of places around the world.

I created a wiki page stub for people to add to if they have any knowledge on this issue.

Do you know of an RSS feed for traffic updates? Post it to the wiki!