| adjust_arrival_departure | Adjust the arrival and departure times of a GTFS data |
| adjust_speed | Adjust the speeds of a gps-like table created with 'gtfs2gps' |
| append_height | Add a column with height to GPS data |
| filter_single_trip | Filter GTFS trips in order to have one trip per shape_id |
| filter_valid_stop_times | Filter GTFS data using valid stop times |
| gps_as_sflinestring | Converts a GPS-like data.table to a LineString Simple Feature (sf) object |
| gps_as_sfpoints | Convert GPS-like data.table to a Simple Feature points object |
| gtfs2gps | Convert GTFS to GPS-like data given a spatial resolution |
| gtfs_shapes_as_sf | Convert GTFS shapes to simple feature object |
| gtfs_stops_as_sf | Convert GTFS stops to simple feature object |
| read_gtfs | Read GTFS data into a list of data.tables |
| remove_invalid | Remove invalid objects from GTFS data |
| simplify_shapes | Simplify shapes of a GTFS file |
| test_gtfs_freq | Test whether a GTFS feed is frequency based |
| write_gtfs | Write GTFS data into a zip file |