Cul-de-sacs have less traffic (no through traffic). In many markets, especially in Houston, home buyers, especially those with children love it! New urbabnist's hate it, they feel (and rightfully so) that it reduces vehicular connectivity and new urbanist would prefer a more grid pattern, mostly to give a driver more than one option to get from point A to point B, therefor not reducing overall traffic counts, but not putting all of the cars on one or two main roads.
But, again, in Houston, cul's rule and that is what buyers want, so that is what buyers get. I live in one, and I always seem to notice when a car that doesn't live there comes into it, usually a lost driver. i notice because traffic is so low, less than 20 cars a day, so nice and quite, especially for those of us with families.
Glad to see you still have no idea what you are talking about. Will you ever learn to have some actual, true, practical, relevant and useful knowledge about anything before commenting.