Proof-of-payment
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Proof-of-payment or POP is an honor-based fare collection approach used on many public transportation systems. Instead of checking each passenger as they enter a fare control zone, proof-of-payment requires that each passenger carry a ticket or pass proving that they have paid the fare. Ticket controllers or conductors make periodic checks to deter fare evasion. On many systems, a passenger can purchase a single-use ticket or multi-use pass at any time in advance, but must insert the ticket or pass into a validation machine before use. Validation machines in stations or on board vehicles time stamp the ticket. The ticket is then valid for some period of time after the stamped time.
The proof-of-payment method is implemented when the transit authority believes it will lose less money to the resultant fare evasion than it would cost to install and maintain a more direct collection method. It may be used in systems whose passenger volume and density are not very high most of the time—as passenger volumes increase, more-direct collection methods become more profitable. However, in some countries it is common even on systems with very high passenger volume.
POP can be complemented with a more direct collection approach where this would be feasible—a transit authority utilizing POP will usually post fare inspectors, sometimes armed as a police force, to man entrances to stations on a discretionary basis when a high volume of passengers is expected. For example, transit users leaving a stadium immediately following a major concert or sporting event will likely have to buy a ticket from an attendant (or show proof of payment) to gain access to the station(s) servicing the stadium.
Travel without a valid ticket is not usually considered a crime, but a penalty fare is charged.
Advantages and disadvantages
Advantages of proof-of-payment include lower labor costs for fare collection, simpler station design, easier access for mobility-impaired passengers, easier access for those carrying packages or in case of an emergency, and a more open feel for passengers. On buses, proof-of-payment saves drivers the time needed to collect fares, and makes it possible for all doors to be used for boarding. Validated tickets can double as transfers between lines.
Disadvantages include potentially higher rate of fare evasion, reduced security on station platforms when no barrier is used, increased potential of racial profiling and other unequal enforcement as "likely fare evaders" are targeted, and regularly exposing passengers to unpleasant confrontational situations when a rider without the proper proof is detained and removed from the vehicle. Visitors unfamiliar with a system's validation requirements who innocently misunderstand the rules are especially likely to get into trouble.
Worldwide uses
Proof-of-payment is popular in Germany, where it was widely introduced during the labor shortages resulting from the Economic Miracle of the 1960s. It has also been adopted in Eastern Europe and Canada and has made some inroads in newer systems in the United States. The first use of the term "POP" or "Proof of Payment" on a rail line in North America is believed to have been in Edmonton in 1980.
Systems using proof-of-payment
Rail
- All German S-Bahn, U-Bahn and Stadtbahn (light rail) systems, as well as most German tramway systems
- Majority of public transport systems in Central Europe and Eastern Europe
- Altamont Commuter Express
- Baltimore Light Rail
- Surface portions of Boston's MBTA Green Line
- Buffalo Metro Rail
- Calgary C-Train
- Charlotte, North Carolina LYNX
- Greater Cleveland Regional Transit Authority Red Line Rapid Transit
- Copenhagen Metro and Copenhagen S-Train
- Dallas Area Rapid Transit's Light Rail system and Trinity Railway Express
- Denver, Colorado Regional Transportation District
- Edmonton Transit System
- GO Transit
- Helsinki commuter rail
- Helsinki Public Transit
- Hiawatha Light Rail Line Twin Cities, Minnesota
- MTR Light Rail in Hong Kong
- METRORail of the Metropolitan Transit Authority of Harris County, Texas in Houston, Texas
- Line 1 (ISAP) of the Attiko Metro in Athens, Greece
- Los Angeles County Metro Rail
- Docklands Light Railway, London, United Kingdom
- Luas, Dublin, Ireland
- NJ Transit light rail lines: Newark Light Rail, Hudson-Bergen Light Rail, and River Line
- Metrolink in Southern California
- Montreal's Agence métropolitaine de transport commuter trains
- Mumbai Suburban Railway
- Ottawa, Ontario O-Train
- Phoenix, Arizona Metro Light Rail
- Portland, Oregon TriMet
- Sacramento, California RT Light Rail
- San Diego Trolley
- San Francisco Bay Area Caltrain
- San Francisco Municipal Railway[1]
- Santa Clara Valley Transportation Authority (VTA)
- Seattle, Washington Sounder Commuter Rail and Central Link light rail (Sound Transit)
- St. Louis MetroLink
- TTC 501 Queen
- Translink (Vancouver)
- Tyne and Wear Metro
- Utah Transit Authority TRAX
- Vienna U-Bahn and Trams
- Virginia Railway Express
- Zagreb ZET
Bus
- Greater Cleveland Regional Transit Authority HealthLine
- Coast Mountain Bus Company (Vancouver) and Translink (Vancouver)
- Copenhagen buses
- Innsbruck Public Transport
- LACMTA Orange Line
- MTA New York City Bus Select Bus Service
- VIVA - York Region's Bus Rapid Transit in the Regional Municipality of York in Ontario, Canada
- Ottawa, Ontario articulated buses
- Paris Bus (RATP)
- Pioneer Valley Transit Authority's Amherst, MA-based (UMass Transit) fixed routes
- San Francisco Municipal Railway (all bus routes) [2]
- Tallinn Public Transport
- RTA buses, Dubai