Yeah (but as another commenter says, a cul de sac only for cars, not for bicycles or walking).

It's not designed for stop traffic totally, just to disincentivize some (most maybe?) kind of traffic. The idea is also make those areas kind of "independent". In the sense that they should have most of all necessary services. Places for buying your groceries, medical services, small business..

Of course, in practice it's not ideal, they are still learning.