gates (AOG), and Autonomous Farecard Access System (AFAS) gates for wheelchair access). Passengers enter the subway by swiping farecards to unlock the turnstiles. Typical control areas feature low turnstiles, one or more EXGs, and a token booth. Unstaffed entrances that were remodeled before the late 2000s featured only HEETs and EXGs. Exit-only locations have only HXTs and EXGs. All control areas must have at least one EXG, as per State emergency regulations. Systemwide EXG installations since 2006 introduced a weakness into otherwise secure AFC systems. Gates were originally only unlocked via booths' buzzers or employees’ keys. After London Underground’s 2005 terrorism attacks, fire codes required “panic bars”, allowing each gate to be opened from the paid side, expediting emergency evacuation. While a loud, piercing, and warbling alarm sounds whenever EXGs are opened, general public took to using gates for exiting (substantially reducing queues), especially at unstaffed locations. It happened so often that in January 2015, the MTA silenced all exit alarms. Per MTA fare tariff, exceptions to normal turnstile operations abound. Children under (turnstile machines’ top height) must crawl under when entering with fare-paying adults (not permissible when travelling alone). Those with bulk items (bicycles, strollers, packages) must request station agent witness their swiping farecard, rotating turnstile without entering, then enter through an AOG with their items. Passengers with paper half-fare or “block” tickets must relinquish them to the agent and enter through a SET. School groups traveling with authorization letters may be admitted through an AOG. An added complication is several unofficial system entry methods resulting in no revenue loss but forbidden by tariff are frequently practiced. At unstaffed locations, fellow passengers often open EXGs for entry by customers with bulk packages after witnessing them rotate turnstiles without entering. Children often squeeze through HEETs with paying adults (if under 44”, no revenue loss occurs). At token booths, agents often admit passengers through an AOG or SET for operational reasons. Police in uniform, construction workers, contractors in safety vests, employees, and concession vendors often enter with keys or agent's permission. Police officers or station agents sometimes allow student groups to enter through gates. History New York City's transit system in the 1970s was in disarray. Subway ridership was declining, while private express buses mushroomed, exacerbating Transit Authority's (TA) problems. Crime was rampant; derailments, fires, breakdowns, and assaults were commonplace. Trains and stations were covered in graffiti. Passengers were actually afraid