Four thousand miles of smooth blacktop. Six open lanes of road with never a traffic jam. Four lanes for trucks to keep the 18-wheelers from bothering Joe Motorist. High-speed rail to get you from San Antonio to Dallas in just a couple of comfy hours. Oil, gas, and water lines running from Oklahoma to the Mexican border. Handy motels, shops, and gas stations to keep you from having to get off the road until you hit the state line. That’s the dream of the backers of the Trans-Texas Corridor, the biggest public works project in the history of the state...