HILLSBORO, Texas — Leroy Walters has survived many a threat on the farm that has been in his family for 120 years — droughts, hailstorms, tornadoes, grasshopper attacks. But now he sees a manmade danger on the horizon: a colossal, 600-mile superhighway that will plow clear across Texas, perhaps cutting through Walters' milo and corn fields, obliterating family houses and robbing his grandchildren of their land. "I don't think they're going to want to pay a toll to go across this land," he said. "They want to enjoy it free, as Texans should enjoy it." That kind of fear and...