...who went left of center to pass me as I coasted down to a red light. On a residential street. Who then sat at the red with me behind them. With dealer plates and frames. On a used Rolls-Royce. Inconspicuous, that was not.
And then went left of center again on a main road, this time to go around an ambulance.
Probably just a porter who felt the need to take a test drive to the other side of town.