8:10 p.m. I press the button for the HAWK signal and when the Voice tells me to walk, I do. As I finish crossing the street (with 10 seconds or so to spare) I hear the cars behind me start moving. Not for the first time. And I wonder: Is the HAWK sign like a stop SIGN, where a car waiting for the person to cross and then going is the right thing to do? Or is it like a stop LIGHT, where it’s not?