Traffic... again

Instapundit linked to a book that piqued my interest and I thought I'd mention...

Most of the assumptions are definitely not news to me, but #3 caught my eye:

  • Traffic congestion does much more harm than is generally appreciated
  • Municipalities' programs aimed at making traffic worse in order to encourage people to use mass transit are deeply mistaken
  • Fixing traffic problems is easier and cheaper than is popularly thought

Well, now I've just got to buy it. Isn't this refuted by market forces though? That is to say, if it was so easy and cheap to fiix the traffic problems, wouldn't they be FIXED?