A flash mob of commuters is going to know whether a stop is 2-way or 4-way (there are signs), and they are going to know what the speed limit is (there are signs). If someone is as attentive as they need to be while driving, it's irrelevant whether the park is a playground or there are three schools nearby or whether there are kids in a given house. I don't know about you, but if I'm somewhere I've never been before because I'm going around a traffic jam, I am even more attentive than normal.

If someone isn't as attentive as they need to be, that's a different problem altogether.