to Toronto Police Service officers. During the phase out of the Special Constables, the Toronto Police reinstated its Transit Patrol Unit, which had been cancelled in the mid-1990s. The Special Constables were replaced by bylaw enforcement officers known as Transit Enforcement Officers, as part of the TTC's Transit Enforcement Unit. The negotiation between TTC and the Toronto Police Services Board took place in 2013 resulting in restored Special Constable Status and Peace Officer Authority. There is a difference between special constables and fare inspectors. Fare inspectors have no authority to detain a person, and so it is possible to simply walk away with no repercussions. In contrast, special constables have the same authority as police officers. Bylaws enforced The TTC's By-law No. 1 is a by-law governing the actions of passengers and employees while on Commission property. It can be enforced by a "proper authority" which is defined in the by-law as: "an employee or agent of the TTC wearing a TTC uniform; an employee or agent of the TTC carrying an identification card issued by the TTC; or a municipal police officer." The by-law covers rules regarding fare payment and conduct while in the system. Effective October 12, 2009, a revised version of the by-law has been issued. Revisions include the restriction of placing feet or "any object that may soil" on seats, the prohibition against using offensive language (including via the user-generated displays at Pioneer Village station, which are part of the public art installation LightSpell, although the displays have not yet been activated), and the provision that one must give up their seat to a person with a disability or pregnancy in priority seating areas. Communications The TTC uses three primary voice and data communication systems. The first is the system used by Operations, Security and Maintenance. This system operates on five UHF conventional frequencies. Channels 1, 3, 4 and 5 are used for day-to-day operations, while Channel 2 is reserved for the Wheel-Trans service. The second system, the Communications and Information System (CIS), is used by buses and streetcars, and employs transmission facilities throughout the city. Conceived in the late 1970s and fully implemented in 1991, it consists of a computer unit on board each bus and streetcar, called the Transit Radio Unified Microprocessor (TRUMP). This is attached to a transponder receiver, which allows CIS operators to track the location of the vehicle using a computational