But you can't turn left, because this street is narrow—and gets still narrower toward its seaward end, like a funnel. I can't stop you going this way if you're on foot, or bicycle. —Yes, I could: I could play at being the occasional Homo officiosus who meets us with "Hey, you can't ride along here, it's a one-way!" I think I'll do that to you: make you turn round and come back along this little street.