Proponents have called the state’s massive new toll road project a monumental opportunity and a thoughtful plan for smart growth. The 330 miles of new highways will curb interstate congestion, bolster the economy and facilitate hurricane evacuations, they say. In short, the argument goes, the roads would be a good investment. So why is it that so many of the preliminary studies are at best lukewarm on the idea? And the latest reports only add to the list of reasons to reconsider the controversial project. The tolls roads, dubbed the Multi-use Corridors of Regional Economic Significance, were largely pushed by...