Fares

Contact Info

• Leonard Ehrenfried (mail@leonard.io)

Changelog

• Initial move into sandbox #4241
• Add HighestFareInFreeTransferWindowFareService #4267
• Add Fares V2 #4338
• Add CombineInterlinedLegsFareService #4509

Documentation

The code in this sandbox used to be part of OTP core but to allow more experimentation - in particular regarding GTFS Fares V2 - it was moved into a sandbox.

Fares V2

In 2022 the GTFS spec was extended to contain a powerful new model, called Fares V2, to describe fares, prices and products for public transport tickets. A baseline effort was merged into the main spec in May.

OTP experimentally supports the merged baseline plus a few extensions from the larger, unmerged spec.

To enable Fares V2 support, add the following to otp-config.json:

{
  "otpFeatures" : {
    "FaresV2" : true
  }
}

Supported Fares V2 fields

A full list of the fields that OTP supports is available in the Fares V2 Adoption Google Sheet.

Custom fare calculators

When the GTFS Fares V1 spec was not enough, some organizations have developed their own calculators which are also part of the sandbox code.

The classes and their maintainers are as follows:

class	maintainer
HighestFareInFreeTransferWindowFareService	IBI Group (David Emory)
AtlantaFareService	IBI Group (David Emory)
CombinedInterlinedLegsFareService	IBI Group (David Emory)
HSLFareServiceImpl	HSL (Viljami Nurminen)
NycFareServiceImpl	unmaintained
SFBayFareServiceImpl	unmaintained

Removed fare calculators

The following calculators used to be part of the OTP codebase but since their maintainership was unclear and no-one offered to maintain, they were removed in July 2022.

• SeattleFareServiceImpl
• DutchFareServiceImpl

If you were using these calculators, you're welcome to re-add them to the code base.

Fares configuration

By default OTP will compute fares according to the GTFS specification if fare data is provided in your GTFS input. It is possible to turn off this by setting the fare to "off". For more complex scenarios or to handle vehicle rental fares, it is necessary to manually configure fares using the fares section in build-config.json. You can combine different fares (for example transit and vehicle-rental) by defining a combinationStrategy parameter, and a list of sub-fares to combine (all fields starting with fare are considered to be sub-fares).

// build-config.json
{
  // Select the custom fare "seattle"
  "fares": "seattle"
}

Or this alternative form that could allow additional configuration

// build-config.json
{
  "fares": {
    "type": "seattle"
  }
}

// build-config.json
{
  "fares": {
    // Combine two fares by simply adding them
    "combinationStrategy": "additive",
    // First fare to combine
    "fare0": "new-york",
    // Second fare to combine
    "fare1": {
      "type": "vehicle-rental-time-based",
      "currency": "USD",
      "prices": {
          // For trip shorter than 30', $4 fare
          "30":   4.00,
          // For trip shorter than 1h, $6 fare
          "1:00": 6.00
      }
    }
    // We could also add fareFoo, fareBar...
  }
}

Turning the fare service off, this will ignore any fare data in the provided GTFS data.

// build-config.json
{
  "fares": "off"
}

The current list of custom fare type is:

• vehicle-rental-time-based - accepting the following parameters:
  • currency - the ISO 4217 currency code to use, such as "EUR" or "USD",
  • prices - a list of {time, price}. The resulting cost is the smallest cost where the elapsed time of vehicle rental is lower than the defined time.
• san-francisco (no parameters)
• new-york (no parameters)
• seattle (no parameters)
• highest-fare-in-free-transfer-window Will apply the highest observed transit fare (across all operators) within a free transfer window, adding to the cost if a trip is boarded outside the free transfer window. It accepts the following parameters:
  • freeTransferWindow the duration (in ISO8601-ish notation) that free transfers are possible after the board time of the first transit leg. Default: 2h30m.
  • analyzeInterlinedTransfers If true, will treat interlined transfers as actual transfers. This is merely a work-around for transit agencies that choose to code their fares in a route-based fashion instead of a zone-based fashion. Default: false
• atlanta (no parameters)
• combine-interlined-legs Will treat two interlined legs (those with a stay-seated transfer in between them) as a single leg for the purpose of fare calculation. It has a single parameter mode which controls when exactly the combination should happen:
  • ALWAYS: All interlined legs are combined. (default)
  • SAME_ROUTE: Only interlined legs whose route ID are identical are encountered.
• off (no parameters)

The current list of combinationStrategy is:

• additive - simply adds all sub-fares.