Pay as you go, or PAYG, in the context of public transport, refers to a method of fare collection where the fare is only charged at or after usage, depending on the actual usage, instead of buying a ticket in advance. In such a case, the payment method itself, when validated, is the proof-of-payment, with the actual journey detail not yet known.
When using pay as you go, you don't have to buy a ticket. Instead, you just tap on and off, [1] and the system will automatically charge you the correct amount, without an actual physical ticket. [2]
Pay as you go ticketing has become possible since the existence of automated fare collection. Fares can be charged automatically from ticket barriers, instead of the earlier form of ticketing, where a prospective passenger must visit a ticket office to buy a ticket, which is valid for a number of specified rides on a specific network / route, or buy a ticket from the conductor on board.
Common stored value ticket was a ticket used on the MTR network in the 1980s and 1990s. Instead of being valid for a single or a number of rides, the ticket was sold at a value, where the fare was deducted after each ride, and recycled by the ticket barrier when it goes out of value. This was a predecessor to stored value cards, developed to be a more durable replacement of magnetic tickets.
Upass in South Korea was the first commercial-used RF card for transportation in the world (first used in June 1996)¹, followed by Octopus card in Hong Kong, which replaced the common stored value tickets. Unlike the common stored value ticket, these stored value cards operate on RFID and can be topped up and reused.
Stored value transport cards are specific to each region, for example, Octopus cards can only be used in Hong Kong, while Oyster cards can only be used in London and a limited surroundings. Although it's a one-time purchase for residents, visitors still need to buy a card specific to the region, and it can be hard to get any remaining value back after leaving.
During the 2010s, public transport providers start to develop contactless payment as an alternative to stored value card. Contactless payment does not require a passenger to buy a stored value card and prepaid credit into it, instead, it is linked to the account specified by the payment method, for example, a credit card or a debit card, and any cards / devices in the global payment network, such as Mastercard, can be used for payment.
Pay as you go systems have been implemented using the following payment methods:
The Octopus card is a reusable contactless stored value smart card for making electronic payments in online or offline systems in Hong Kong. Launched in September 1997 to collect fares for the territory's mass transit system, it has grown into a widely used system for transport and other retail transactions in Hong Kong. It is also used for purposes such as recording school attendance and permitting building access. The cards are used by 98 percent of the population of Hong Kong aged 15 to 64 and the system handles more than 15 million transactions, worth over HK$220 million, every day.
The Oyster card is a payment method for public transport in London in England, United Kingdom. A standard Oyster card is a blue credit-card-sized stored-value contactless smart card. It is promoted by Transport for London (TfL) and can be used on travel modes across London including London Buses, London Underground, the Docklands Light Railway (DLR), London Overground, Tramlink, some river boat services, and most National Rail services within the London fare zones. Since its introduction in June 2003, more than 86 million cards have been used.
The Beijing Municipal Administration & Communication Card, more commonly known as the Yikatong, is a stored-value contactless smart card used in Beijing, China, for public transportation and related uses. It is similar to Hong Kong's Octopus card, Singapore's CEPAS, The OMNY Card in New York City, United States, or the Oyster Card used by Transport for London in London, England.
The EZ-Link card is a rechargeable contactless smart card and electronic money system that is primarily used as a payment method for public transport such as bus and rail lines in Singapore. A standard EZ-Link card is a credit-card-sized stored-value contact-less smart-card that comes in a variety of colours, as well as limited edition designs. It is sold by TransitLink Pte Ltd, a subsidiary of the Land Transport Authority (LTA), and can be used on travel modes across Singapore, including the Mass Rapid Transit (MRT), the Light Rail Transit (LRT), public buses which are operated by SBS Transit, SMRT Buses, Tower Transit Singapore and Go-Ahead Singapore, as well as the Sentosa Express.
The Presto card is a contactless smart card automated fare collection system used on participating public transit systems in the province of Ontario, Canada, specifically in Greater Toronto, Hamilton, and Ottawa. Presto card readers were implemented on a trial basis from 25 June 2007 to 30 September 2008. Full implementation began in November 2009 and it was rolled out across rapid transit stations, railway stations, bus stops and terminals, and transit vehicles on eleven different transit systems.
The CharlieCard is a contactless smart card used for fare payment for transportation in the Boston area. It is the primary payment method for the Massachusetts Bay Transportation Authority (MBTA) and several regional public transport systems in the U.S. state of Massachusetts.
Rail operators are government-assisted profit-based corporations, fares and ticketing on Singapore's Mass Rapid Transit (MRT) system are aimed to break-even or exceed operating expenses. Rail operators collect fares based on account-based (ABT) and card-based ticketing options, the prices of which are calculated based on the distances travelled between the origin and destination. These prices increase in stages for standard non-concessionary travel, according to the distances travelled. In account-based ticketing, the fare is automatically calculated in the back-end and charged to the passenger post journey. On the other hand, card-based ticketing is proprietary to the transport network and the fare is computed by the system based on the store values recorded in the cards. The public transit system is harmonising towards full ABT.
The London Underground and Docklands Light Railway (DLR) metro systems of London, England uses a mix of paper and electronic smart-card ticketing.
A contactless smart card is a contactless credential whose dimensions are credit card size. Its embedded integrated circuits can store data and communicate with a terminal via NFC. Commonplace uses include transit tickets, bank cards and passports.
Network for Electronic Transfers, colloquially known as NETS, is a Singaporean electronic payment service provider. Founded in 1986 by a consortium of local banks, it aims to establish the debit network and drive the adoption of electronic payments in Singapore. It is owned by DBS Bank, OCBC Bank and United Overseas Bank (UOB).
Multivía is a contactless card designed for paying the travel fares in the mass transport system Transantiago, in Santiago, the capital of Chile. Tarjeta Bip! or Bip! Card is a plastic card equipped with a chip, that automatically discounts the cost of a travel when passing the card near a contactless card reader.
CEPAS, the Specification for Contactless e-Purse Application, is a Singaporean specification for an electronic money smart card. The specification was prepared by the Cards and Personnel Identification Technical Committee (CPITC), under the purview of the IT Standard Committee of Singapore (ITSCS). It has been gazetted as Singapore Standard SS 518 by Enterprise Singapore. CEPAS has been deployed island-wide, replacing the previous original EZ-Link card effective 1 October 2009.
Contactless payment systems are credit cards and debit cards, key fobs, smart cards, or other devices, including smartphones and other mobile devices, that use radio-frequency identification (RFID) or near-field communication (NFC) for making secure payments. The embedded integrated circuit chip and antenna enable consumers to wave their card, fob, or handheld device over a reader at the Point-of-sale terminal. Contactless payments are made in close physical proximity, unlike other types of mobile payments which use broad-area cellular or Wi-Fi networks and do not involve close physical proximity.
Opal is a contactless smartcard fare collection system for public transport services in the greater Sydney area and most other urban areas of New South Wales, Australia. Operation of the Opal system is managed by the New South Wales Government's transport authority, Transport for NSW. First launched in late 2012, Opal is valid on Transport for NSW's metro, train, bus, ferry and light rail services that operate in Sydney and the neighbouring Central Coast, Hunter Region, Blue Mountains, Illawarra and Southern Highlands areas. Opal equipment was designed from the start to support a variety of cards, but launched with the captive Opal cards.
GO Transit is the inter-regional transportation authority of the Golden Horseshoe, which includes the Greater Toronto and Hamilton Area. It is Canada's oldest regional transit system, first serving passengers in 1967.
MetroCARD is a contactless smartcard ticketing system for public transport services in the Adelaide city and suburbs in South Australia. The system is managed by Adelaide Metro and is usable on their bus, train and tram services.
The Metrebus Card is a contactless smartcard ticketing system for Rome. It has stored value on a paper ticket for either 1, 3 or 7 days. All three versions of the tickets look the same on the front, but on the back of the ticket the magnetic data printed on the ticket varies depending on which version of the ticket was purchased.
Hop Fastpass is a contactless smart card for public transit fare payment on most transit modes in the Portland, Oregon, metropolitan area including MAX Light Rail, WES commuter rail, Portland Streetcar, The Vine, and all TriMet and C-TRAN buses. An initial release to the general public began on July 5, 2017, with the official launch on July 17. The program is managed by TriMet.
OMNY is a contactless fare payment system, currently being implemented for use on public transit in the New York metropolitan area. OMNY can currently be used to pay fares at all New York City Subway and Staten Island Railway stations, on all MTA buses, AirTrain JFK, Metro North's Hudson Rail Link, and on the Roosevelt Island Tram; when completely rolled out, it will also replace the MetroCard on Bee-Line buses, and NICE buses. OMNY will also expand beyond the current scope of the MetroCard to include the Long Island Rail Road and Metro-North Railroad.
Fare capping is a feature of public transport fare collection systems. Fare capping credits the cost of fares for individual trips towards the cost of an unlimited pass, limiting the cost of fares that passengers pay.