Commuting is a community. The interactions between the members of this community are complicated and yet incredibly simple at the same time. Each is trying to get to their destination as quickly and safely as possible. This shared interest is what holds the group together. Yet, the need to keep traffic moving efficiently complicates the interactions as individual members make decisions such as when to let someone in traffic in front of them. Aggressive driving or road rage can also cause a breakdown in the group's interactions, and it also adds tension which works against community cohesion.
As a driver to commutes to Seattle several times a week, I am part of this community. However, it is not one that I want to be part of. The drive is long, frustrating, and costs a lot of money in gas and engine maintenance. I suspect there are a lot of other members of this community that would agree with me.