Enumeration GTFSDirectionIdConst

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). Example: The trip_headsign and direction_id fields may be used together to assign a name to travel in each direction for a set of trips. A trips.txt file could contain these records for use in time tables:

trip_id,...,trip_headsign,direction_id
1234,...,Airport,0
1505,...,Downtown,1
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