更新1:
Are parking restriction zones effective before the sign, or after it? I'm parked on a weird street where there's a sign that says "Tow Away 2 am-6am." Then there's a section on the same street where it doesn't say "Tow Away." And then the section before THAT one, it says it again. There's a few cars parked where I'm at. But it's just vacant enough that I'm a little nervous.