As a displaced Northerner, who is supposed to be accustomed to these road designs, I can attest to their continuing scarcity in northern parts, too. When one was proposed for my CT neighborhood in preference to a traffic signal, I was skeptical. Until it went in. It takes very little time and attention to adapt to this less-familiar traffic moderator, and I can attest to its instant calming of traffic speed and patterns. It turned out to be an excellent alternative, from several points of view. Just sayin'...