Automated passenger counter
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An Automated Passenger Counter (APC) is an electronic device available for installation on transit vehicles including buses and rail vehicles which accurately records boarding and alighting data. This technology can improve the accuracy and reliability of tracking transit ridership over traditional methods of manual accounting by drivers or estimation through random surveying. These devices are becoming more common among American transit operators seeking to improve the accuracy of reporting patronage as well as analyzing transit use patterns by linking boarding and alighting data with stop or station location.
APCs work using infared lights above the doorways to a vehicle. A set of invisible (to the human eye) beams of infared light shine down, spaced so that the order in which the beam is broken by a person determines if they are entering or exiting the vehicle. Except in extreme crush-loads the accuracy of this technology is quite high.
The APC computer can also integrate with an on-board GPS system to link passenger data to vehicle location. This provides a wealth of data for agencies to analyze about the utilization of the system based on location, direction of travel, and time.
Like many other data-collection applications on board transit vehicles, the information can be transmitted wirelessly to a server when a bus is garaged for the day, may need to be downloaded through a physical connection, or could be uploaded in real time.
The use of APCs is beneficial for transit service planning as well as accuracy of reporting. APCs can be especially helpful in high passenger volume applications such as subway and light rail or Bus Rapid Transit. APCs can be crucial in allowing all-door boarding on buses for gathering accurate patronage data and comparing that data to fare revenues.
Use in California
It is likely that most large transit agencies in California are already utilizing APC technology. Los Angeles County Metropolitan Transportation Authority (Metro) has incorporated this technology in their fleet.
National Center for Transit Research. "A Guidebook for Using Automatic Passenger Counter Data for National Transit Database (NTD)Reporting" 2010.
Transit Cooperative Research Program. TCRP Synthesis 77 "Passenger Counting Systems." 2008