Traffic: Can't live with it; can't live without it. That's the dilemma Dallas leaders face as they survey the proposed Trans-Texas Corridor, Gov. Rick Perry's plan for a new network of highways crisscrossing the state to be built as toll roads by private companies. Dallas' interstates are choked with traffic, but if Mr. Perry diverts that traffic – especially the long-haul commercial trucks – beyond the city limits, he will siphon off the city's economic lifeblood. No wonder city leaders are squawking over preliminary maps that show the new corridor being located as far as 50 miles from Dallas' doorstep....