Heh, hard to know. Arlington sometimes does it right away, sometimes in the morning. This time they even had the sidewalks cleared before the storm stopped. Last year I remember feet of snow on the sidewalks staying there for several days.
This am plenty of iced up portions on the bikeway. A surprisingly healthy number of cyclocommuters, though some of them seemed a little less prepared for/happy with the ice. My bike did OK but there were a few sketchy places where my back tire lost traction on acceleration - thankfully, no sideways motion. Judging from yesterday's weather I thought things would melt away and dry out more, but I was wrong. A little too icy and dirty for my tastes - maybe it was a mistake to take my steel bike out.