Michael Phelps' Cadillac Escalade and a Honda Accord went boom around 9 p.m. last night in Baltimore.

Someone ran through a stoplight and Michael's SUV and the Honda collided and a third car, that was not moving, was hit as a result.

The po po says that the pot smoker was not intoxicated. Phelps was not given a field sobriety test because the cops determined that one was not necessary. Mikey then refused medical treatment and left in a "personal vehicle."

The woman in the Honda Accord complained of "head and arm pain," which means she intends on suing Phelpsy for big money.