The North Texas Tollway Authority (NTTA) is a toll-financed Regional Tollway Authority and a political subdivision of the State of Texas. The NTTA is empowered to acquire, finance, construct, maintain, repair, extend, expand, and operate turnpike project within a four county North Texas Metropolitan Region and abutting counties by raising capital through the issuance of tax-exempt turnpike revenue bonds and other financing instruments. Debt service is paid from toll revenues collected on the NTTA’s turnpike projects. The projects being operated by the NTTA in 20ll include the Dallas North Tollway, President George Bush Turnpike, Sam Rayburn Tollway, Mountain Creek Lake Toll Bridge, Lewisville Lake Toll Bridge, and Addison Airport Toll Tunnel, cumulatively being 94 centerline miles of tolled highways which recorded an average of 1.32 million transactions daily in calendar year 2010.