![]() These limitations led to development of the TS 2 controller standard, developed in 1992. ![]() Additional limitations were identified with pretimed operations and capabilities beyond basic traffic control. In some cases, system communications was not part of the fourth connector and was brought in through yet another connector. Manufacturers independently added a fourth connector for preemption, coordination, additional detector inputs, and system communications that were not interchangeable, preventing enhanced controller functions. The TS 1 standard focused on the three primary equipment connectors on the front on the controllers. A Timeline Showing The Evolution of Traffic Controller Standards From 1920 to PresentĪdvances in technology and the desired functionality of the TS 1 controllers created several issues. ![]() The standard defined basic actuated intersection control, but did not specify hardware allowing controller capabilities to expand with technology.įigure 33. A controller cabinet designed to house the controller and associated equipment was also specified, including all of the supporting wiring and configuration. All of the equipment and software necessary to support the controller operation was specified. The NEMA TS-1 traffic signal controller standard was developed in 1976, with the goal of providing interchangeability among manufacturers. The evolution of both the NEMA and Caltrans/NYDOT standards are presented in Figure 33 below. TRAFFIC SIGNAL CONTROL Evolution of Controller Standards
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