Using The War Tapes and Al Gore's An Inconvenient Truth as primary examples, the Times' David Carr recently argued that documentaries have become an effective vehicle for advocacy journalism, and are quite successfully turning "the most boring of issues and public personalities into an entertainment."Add to this genre a new doc from Transportation Alternatives, Contested Streets: Breaking NYC Gridlock, which will premier next week at the IFC Center in the Village. Whether or not this doc rises to the level of "entertainment" remains to be seen, but it will show how other cities are using innovative ideas and technology to solve traffic problems ... and, of course, how New York is not.