One of the defining characteristics of sprawl is a branching street pattern -- one in which cul-de-sacs feed residential streets, which feed local arteries, which feed thoroughfares, which ultimately feed freeways. It's a design that can work fine for cars, but not so well for people. I spent (or misspent) part of my childhood in that sort of neighborhood. There were houses that were literally 100 yards from my house as the crow flies, but nearly a mile by the road network. That sort of thing discourages, you know, walking and stuff. Which is one reason why people who care about promoting walking and biking as transportation prefer an interconnected street network to a hierarchical one.
Now, Wendell Cox, a smart-growth skeptic and fellow of the Heartland Institute, writes in defense of the cul-de-sac: