The federal government does very little tracking and auditing of how the $40 billion it spends yearly on state highway infrastructure projects is used, and huge cost overruns often go unchecked, according to an investigative report. Causes of overruns include planning lapses, design errors and unforeseen obstructions during construction, but the report also cites the lack of federal oversight as a contributory factor. Federal Highway Administrator Victor Mendez says it's the state's responsibility to oversee the projects. Some states that analyze costs, identify possible risks and track projects closely often saw projects completed under budget, according to a report by the American Association of State Highway and Transportation Officials.

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