I would not consider it necessary to carry ID for police reasons, but for accident reasons it would be a good idea. Probably good idea if you are not in your home town.

And very sadly often, people come to low-income, and I think this was mentioned as a high crime neighborhood, for the specific purpose of buying drugs. If you live in that neighborhood you have a right to report suspicious behavior, which depending on your paranoia could be almost anyone, or depending on your actual experience with neighborhoods deteriorating overnight, could still be a whole lot of people you don't recognize. mg