Yes, you read that correctly.
"The man got out of the car and stabbed the officer, Tomioka
said. It was not immediately clear what the dispute was about."
And yes, you read that correctly. The cyclist that was stabbed was an
off duty San Francisco Cop.
Update: Video from Channel 2
This is great - "He has some anger issues".
What's annoying is that this guy will probably take it on the chin pretty badly because coincidentally the victim was a cop. Had Joe Public been stabbed, would the response be similar?