The one thing Dallas did in the 70s was to take all of the major roads going north and south and turn them into six lanes with a boulevard in the middle. That has done a lot to alleviate traffic congestion across the city.
Another thing Dallas did in the 70s was bus school kids across town. Black kids to predominantly white schools and white kids to black schools. That greatly increased the traffic congestion. They’d have had it worse if it weren’t for the white fight outta there.