I think most planners expected the hub of CT to be in Hartford. Of course that happened but also in other parts of the state now as well. Places such as Danbury, Norwalk, Meriden, Waterbury etc. Unfortunately the road network was never upgraded to handle all of the traffic. New Haven has NO beltway but similiar cities such as Worcester and Springfield, MA do!
Also, notice with CT-8 and CT-25 overlap. At the split, 3 lanes go NW for CT-25 and 2 lanes for ND for CT-8. Clearly the DOT expected more traffic for CT-25, but nowadays more traffic goes right for CT-8. Of course CT-25 narrows to a two lane road after the expressway. The DOT planners got it wrong.