Eh there are a lot of factors, including how your city is designed. Car centric cities usually have less sense of community than cities with good transit or walkability. This is because nobody chats with the person next to them in traffic but some people will chat on the street or on the train. But on the flip side, car centric small towns can have a lot of community, mostly because the place is so small everyone kinda knows everyone and most people rely on the same businesses.