Obviously Ahh-nuld had nothing to do with this (turns out Hummers are banned, too!) Seems that vehicles over 6,000 lbs. gross vehicle weight have
always been banned on residential streets in many California (and other) cities -- and a lot of the really large "Family Assault Vehicles" are over the limit!
http://slate.msn.com/id/2104755/It's no accident the automakers churn out so many SUVs that break the 6K barrier. By doing so, these "trucks" (and that's how they're classified by the U.S. Department of Transportation) qualify for a huge federal tax break. If you claim you use a 3-ton truck exclusively for work, you can write it off immediately. All of it. Up to $100,000 (in fact, Congress raised the limit from $25,000 just last year). Heavy SUVs qualify for similar state tax breaks in California (up to $25,000) and elsewhere. These vehicles are also exempt from the federal "gas guzzler tax" because they're trucks. (And you probably know that many SUVs are exempt from the tougher gas mileage and safety standards of cars because they're classified as trucks, but that's another story.)....
Here's what few people seem to realize: By weighing in at more than 6,000 pounds, big SUVs are prohibited on thousands of miles of road in California. Cities across the state—including San Francisco, Los Angeles, Pasadena, and Santa Monica—use the 3-ton cutoff for many or nearly all of their residential streets. State law gives them the ability to do this for very straightforward reasons: The heavier the vehicle, the more it chews up the roads, endangers pedestrians and smaller vehicles, and makes noise....
But local officials either don't realize they've banned big SUVs, or they're hoping no one will make a stink. For example, San Francisco and Los Angeles ban 6K vehicles on numerous streets (including one of San Francisco's main tourist draws, the famously twisty Lombard Street). One L.A. city council member, Janice Hahn (the sister of L.A. Mayor James Hahn), recently proposed that fines for breaking this law be hiked from $50 for a first offense and $100 for a second to $250 and $1,000, respectively. Hahn told me her district, near L.A.'s huge port complex, is plagued by trucks cutting through residential streets. Remember, friends don't let friends drive SUVs!