bridge spans Mountain Creek Lake in the southwestern Dallas County city of Grand Prairie. Construction was started on TTA's only project outside the area, the Jesse Jones Memorial Bridge across the Houston Ship Channel, in 1979, with the bridge opening in 1982. TTA sold the bridge to the newly created Harris County Toll Road Authority in 1994, leaving all of TTA's assets in the area in which NTTA was later established. NTTA establishment The North Texas Tollway Authority (NTTA) was established in 1997 by Texas Senate Bill 370. The legislation abolished the TTA, which was an independent state agency, and established the Texas Turnpike Authority division of the Texas Department of Transportation. The bill established the NTTA and made it the successor agency to TTA, assuming the prior agencies assets and liabilities. The bill authorized the establishment of other regional tollway authorities and established the laws by which they are governed. TollTag TollTag is the electronic toll collection system used by the NTTA in the Dallas / Fort Worth metro area. It was North America’s first electronic toll collection system when it was installed on the Dallas North Tollway in 1989. There are currently over 4 million TollTags in operation in the North Texas area. The NTTA offers reduced toll rates for TollTag users at all toll points. TollTags can be used on all of the roadways of the NTTA, and they can also be used on any other toll road in the state of Texas as well as for some parking lots in downtown Dallas for parking or toll payment at the Dallas/Fort Worth International Airport (DFW), and at Dallas Love Field Airport (DAL). Current TollTags are small stickers, similar to those used for state inspections and auto registrations, but cannot be moved between vehicles. The previous TollTag was a hard case tag which was affixed to the windshield using velcro tags; these tags are still valid and can be moved between vehicles, but they are not true portable devices—they must be assigned to one vehicle only and, if moved to a different vehicle, require re-registration on the TollTag account. Interoperability 2003 - Texas Department of Transportation (TxTag), Harris County Toll Road Authority and Fort Bend County Toll Road Authority (EZ Tag). August 10, 2014 - Oklahoma Turnpike Authority (Pike Pass). May 17, 2017 - Kansas Turnpike Authority (K-TAG). Criticism In August 2010, the NTTA faced criticism by replacing