Even more than that, there are many places where there is a short narrow section of the same road (e.g. a 1 lane section connecting 2 lanes or 2 lane section co

Even more than that, there are many places where there is a short narrow section of the same road (e.g. a 1 lane section connecting 2 lanes or 2 lane section connecting 3 lanes) that causes hugely inefficient usage. Fixing those is likely to be dramatically more cost/externality efficient than the alternatives. Also, those little squeezes are the very points where the Braess paradox actually shows up. Why let it?