McALLEN — In other parts of the state, transportation officials try to allay property owners' fears that a superhighway from Laredo north to Texarkana will result in a massive land grab. But in the lower Rio Grande Valley, the state's road builders spend more time assuring local leaders that they have a shot at being included. People in the fast-growing border area between Brownsville and McAllen have developed something of an inferiority complex about being the state's largest metropolitan area without an interstate highway. One after another, Valley leaders stepped to a microphone at public meetings last week and made...