Things run late on weekends--stores open late, people get up late (or do they? ). The fact that they make this end at 1pm is to say that all you who enjoy this car-free street will not return home with the same joy. I would have ridden from UES all the way to Brooklyn Bridge if I didn't have something to work on that day. But then I won't be able to come back before 1pm. Some cars that have been suppressed for the early part of the day may even starts roaming on the street with rage. I just find 7am-1pm for such relaxation is like tempting you with a peanut without giving you a second.