Report says that more than $45 billion of the estimate is either in error or undocumented. The state auditor's office on Monday challenged the validity of more than half of a purported $86 billion shortfall in Texas transportation funding over the next generation and cautioned that the estimate "may not be reliable for making policy or funding decisions." That $86 billion, based on 2004 figures, has been cited repeatedly by Texas Department of Transportation officials and some legislators as a major reason for the state's increasing need for new toll roads. The number is a compilation of estimates from local...