http://www.youtube.com/watch?v=gTRTiOZji6g
Sideshows are common in Oakland, but they are not common during daylight hours and they are not common on a major freeway. This scene happened this past Saturday near the Oakland Colosseum. It should be noted that traffic coming to a complete stop for entirely stupid reasons on 880 is a common occurrence. One more video after the jump.
Looking at it from the Southbound lanes:
http://www.youtube.com/watch?v=7i6Ux9UyiAw
Update: CHP made no arrests and said that they are looking at the video to try to capture license plate numbers as well as interviewing witnesses.
Source: SF Gate