Navteq is the company provides the navigation software for most BMWs
Apparently they rolled out the real time traffic updates to the following markets in June 07
Atlanta, Baltimore, Boston, Chicago, Dallas/Ft. Worth, Detroit, Houston, Los Angeles, Miami-Ft. Lauderdale, Minneapolis-St. Paul, New York, Orlando, Philadelphia, Phoenix, Pittsburgh, San Diego, San Francisco/Oakland, San Jose, Seattle, St. Louis, Tampa and Washington DC.
However if the system in the 135i isn't Navteq and runs off the RDS(FM) traffic feed, then most major cities should have this already, especially if you have a TV station that provides real time traffic reporting. That is an indication that the FM traffic update is available, since that is what they typically use.
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