make trips.direction_id an enum #43
Description
Currently, trips.direction_id is an integer, which is a bit confusing.
From the trips.txt reference:
direction_id
Enum
Optional
Indicates the direction of travel for a trip. This field should not be used in routing; it provides a way to separate trips by direction when publishing time tables. Valid options are:
0- Travel in one direction (e.g. outbound travel).
1- Travel in the opposite direction (e.g. inbound travel).