As soon as the driver saw me, she drove off. I didn't see whether she put down her cell phone first or not.
Update: I got this message from SDOT:
This is not an SDOT vehicle. It is a standard city vehicle used by all city departments. SDOT vehicles have our logos on them in blue. I would need a license plate to have facilities folks identify the city department using the vehicle. Perhaps there was an emergency situation that the driver had to respond to a phone call; it’s hard to know the circumstances.
Thank you for contacting SDOT