Dcist: "Fox 5 reports that the vehicle was indeed an Metropolitan Police Department SUV, and that the wreck was not supposed to happen.
There aren't a whole lot of big-time action movie shoots in D.C., so perhaps those tasked with keeping the line between filming and real life are a little rusty. A tipster sends in the above video, which appears to depict the yellow "Bumblebee" sports convertible, which will feature prominently in Transformers 3, t-boning a police cruiser which happened to be driving down 3rd Street SW during filming. The "Bumblebee" apparently was cruising down Maryland Avenue near the National Museum of the American Indian, when it stuck the police vehicle at the Avenue's intersection with 3rd Street. The above video was shot from the Voice of America building at 330 Independence Avenue SW."