Builds the original-specification GTFS fare tables from parsed NeTEx fare
files and attaches them to a GTFS object. A `zone_id` column is added to
`stops` giving each stop its fare zone, and `fare_rules` maps each
origin-zone / destination-zone pair on a route to a fare.
Usage
gtfs_add_fares_v1(gtfs, netex_list, payment_method = 0L)
Arguments
- gtfs
a GTFS object (named list).
- netex_list
list of parsed NeTEx fare objects (already filtered to the
product(s) you want, see [netex_filter_fares()]).
- payment_method
integer, GTFS `payment_method` (0 = paid on board,
1 = paid before boarding). Default 0, matching on-board bus ticket sales.
Value
the GTFS object with `fare_attributes`, `fare_rules` and a
`stops$zone_id` column added.
Details
Because GTFS v1 stores a single `zone_id` per stop, this works cleanly for a
single route; when several routes share a stop but place it in different
fare zones only the first assignment is kept (with a warning).
