MI_rider's post caused me to do something I rarely do: clock my avg speed during a commute. And the answer is: 17.1 MPH.

I tried to keep the commute "normal" in all respects even though I knew that Big Brother was clocking me. I felt pretty strong today in spite of the hard 10K I ran Saturday and the killer MTB hill climb I did yesterday. The lights killed me today, though. I lost 0.5 MPH through San Jose alone with its unending string of traffic lights.