Many of the places where…

Many of the places where traffic is the worst in my city is where large capacity roads (ex. 4 lanes) turn into low capacity roads (ex. two lane), and there's no room to expand the low capacity road. Ensuring more car capacity where possible doesn't reduce traffic, it just adds more potential vehicles to get stuck at the bottlenecks. So I don't understand how it's a useful thing to make it harder for municipalities, who know their cities best, to provide more options for people to keep their cars off the road and lessen traffic.