People are blocking the streets.

Not machine-representable.

We don't care about INsignificant delays: they are hard to detect, have little impact on the user, and would clutter the results as they are too frequent.

Public transit agency employees stopped working.

Default values for Alert fields.

Default values for Alert fields.

Default values for Alert fields.

Default values for FeedEntity fields.

Default values for FeedHeader fields.

Default values for TripUpdate_StopTimeUpdate fields.

Default values for VehiclePosition_CarriageDetails fields.

Default values for VehiclePosition_CarriageDetails fields.

Default values for VehiclePosition fields.

An extra trip that was added in addition to a running schedule, for example, to replace a broken vehicle or to respond to sudden passenger load.

A trip that existed in the schedule but was removed.

An extra trip that was added in addition to a running schedule, for example, to replace a broken vehicle or to respond to sudden passenger load.

Should not be used - for backwards-compatibility only.

Trip that is running in accordance with its GTFS schedule, or is close enough to the scheduled trip to be associated with it.

A trip that is running with no schedule associated to it (GTFS frequencies.txt exact_times=0).

No data is given for this stop.

The vehicle is proceeding in accordance with its static schedule of stops, although not necessarily according to the times of the schedule.

The stop is skipped, i.e., the vehicle will not stop at this stop.

The vehicle is operating a trip defined in GTFS frequencies.txt with exact_times = 0.

The vehicle or carriage can currently accommodate only standing passengers and has limited space for them.

The vehicle or carriage is considered empty by most measures, and has few or no passengers onboard, but is still accepting passengers.

The vehicle or carriage has a relatively small percentage of seats available.

The vehicle or carriage is considered full by most measures, but may still be allowing passengers to board.

The vehicle has departed and is in transit to the next stop.

The vehicle is just about to arrive at the stop (on a stop display, the vehicle symbol typically flashes).

The vehicle or carriage has a relatively large percentage of seats available.

The vehicle or carriage doesn't have any occupancy data available at that time.

The vehicle or carriage is not accepting passengers, but usually accepts passengers for boarding.

The vehicle or carriage is not boardable and never accepts passengers.

People leaving their cars.

The vehicle or carriage can currently accommodate only standing passengers.

The vehicle is standing at the stop.

Enum value maps for Alert_Cause.

Enum value maps for Alert_Cause.

Enum value maps for Alert_Effect.

Enum value maps for Alert_Effect.

Enum value maps for Alert_SeverityLevel.

Enum value maps for Alert_SeverityLevel.

Enum value maps for FeedHeader_Incrementality.

Enum value maps for FeedHeader_Incrementality.

Enum value maps for TripDescriptor_ScheduleRelationship.

Enum value maps for TripDescriptor_ScheduleRelationship.

Enum value maps for TripUpdate_StopTimeUpdate_ScheduleRelationship.

Enum value maps for TripUpdate_StopTimeUpdate_ScheduleRelationship.

Enum value maps for VehiclePosition_CongestionLevel.

Enum value maps for VehiclePosition_CongestionLevel.

Enum value maps for VehiclePosition_OccupancyStatus.

Enum value maps for VehiclePosition_OccupancyStatus.

Enum value maps for VehiclePosition_VehicleStopStatus.

Enum value maps for VehiclePosition_VehicleStopStatus.

An alert, indicating some sort of incident in the public transit network.

A selector for an entity in a GTFS feed.

A definition (or update) of an entity in the transit feed.

Metadata about a feed, included in feed messages.

The contents of a feed message.

A position.

A time interval.

An internationalized message containing per-language versions of a snippet of text or a URL.

A descriptor that identifies an instance of a GTFS trip, or all instances of a trip along a route.

Realtime update of the progress of a vehicle along a trip.

Timing information for a single predicted event (either arrival or departure).

Realtime update for arrival and/or departure events for a given stop on a trip.

Provides the updated values for the stop time.

Defines updated properties of the trip NOTE: This message is still experimental, and subject to change.

Identification information for the vehicle performing the trip.

Realtime positioning information for a given vehicle.

Carriage specific details, used for vehicles composed of several carriages This message/field is still experimental, and subject to change.

Cause of this alert.

What is the effect of this problem on the affected entity.

Severity of this alert.

Determines whether the current fetch is incremental.

The relation between this trip and the static schedule.

The relation between this StopTime and the static schedule.

Congestion level that is affecting this vehicle.

The degree of passenger occupancy of the vehicle or carriage.