People who live in them actually have greater social cohesion, according to one sociologist.
Thomas R. Hochschild Jr. actually first encountered the social cohesion of cul-de-sacs in his latest research when he wandered into one in Connecticut with his clipboard and polo shirt, and someone called the cops. That never happened on the other types of streets he was studying, places where it would turn out the neighbors didn't know each other as well, and it was less clear who "belonged." Repeatedly, though, he found at the end of cul-de-sacs families who watched each others' children and took in each others' mail, who barbequed and orchestrated the removal of snow together, and who considered each other close friends. In cul-de-sacs, these families had a stronger sense of shared social space and territoriality. An outsider stood out.
Via Seth Dixon