For traffic management, I like the idea of roundabouts and twists to control speed better. Red lights and stop signs have inherent deficiencies and we should phase them out. I'd argue that drivers should feel they are going to fast and need to slow down by cues like narrow streets with no onstreet parking, not four lane stroads with 30mph plastered on a five mile perfectly straight stretch.
Most importantly though, we need better public transit or any public transit. Ideally free of cost for the riders and paid for by taxes.