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The Transportation Development District, or TDD, is a mechanism by which the cost of needed transportation improvements are carried proportionately to the burden placed on the existing system by new development. The Transportation Development District Act of 1989 provides for public-private cooperation in the planning and funding of transportation improvements within the boundaries of an approved district, based on a joint planning process involving State, County and local governments and representatives of the private sector.
The first Transportation Development District designated in New Jersey was the I-95/295 Corridor in Ewing, Lawrence and Hopewell Townships, Mercer County. The Mercer County TDD Plan requires new projects with traffic impacts to pay for improvements based on a dollar cost per vehicle trip generated.
The TDD concept is not limited to roadway improvements, however. It is possible to establish a TDD for purposes of funding needed improvements to mass transit systems in downtowns or around existing transit stations. Such a TDD would operate much like a Special Improvement District, but the funds raised would be dedicated to improvements that facilitate the use of buses and/or trains.