From 8993a244f3e90ebac5654d669adbfdf69a70be2d Mon Sep 17 00:00:00 2001
From: Zsombor Welker <flaktack@users.noreply.github.com>
Date: Mon, 25 Jul 2022 14:49:40 +0200
Subject: [PATCH] Add WheelchairAccessible documentation (#340)

---
 gtfs-realtime/proto/gtfs-realtime.proto | 20 ++++++++++++++++++++
 gtfs-realtime/spec/en/reference.md      | 16 ++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/gtfs-realtime/proto/gtfs-realtime.proto b/gtfs-realtime/proto/gtfs-realtime.proto
index 7672a94b..21cc9a0f 100644
--- a/gtfs-realtime/proto/gtfs-realtime.proto
+++ b/gtfs-realtime/proto/gtfs-realtime.proto
@@ -843,6 +843,26 @@ message VehicleDescriptor {
   // The license plate of the vehicle.
   optional string license_plate = 3;
 
+  enum WheelchairAccessible {
+    // The trip doesn't have information about wheelchair accessibility.
+    // This is the **default** behavior. If the static GTFS contains a
+    // _wheelchair_accessible_ value, it won't be overwritten.
+    NO_VALUE = 0;
+
+    // The trip has no accessibility value present.
+    // This value will overwrite the value from the GTFS.
+    UNKNOWN = 1;
+
+    // The trip is wheelchair accessible.
+    // This value will overwrite the value from the GTFS.
+    WHEELCHAIR_ACCESSIBLE = 2;
+
+    // The trip is **not** wheelchair accessible.
+    // This value will overwrite the value from the GTFS.
+    WHEELCHAIR_INACCESSIBLE = 3;
+  }
+  optional WheelchairAccessible wheelchair_accessible = 4 [default = NO_VALUE];
+
   // The extensions namespace allows 3rd-party developers to extend the
   // GTFS Realtime Specification in order to add and evaluate new features and
   // modifications to the spec.
diff --git a/gtfs-realtime/spec/en/reference.md b/gtfs-realtime/spec/en/reference.md
index f5a92de5..95d05d2b 100644
--- a/gtfs-realtime/spec/en/reference.md
+++ b/gtfs-realtime/spec/en/reference.md
@@ -46,6 +46,7 @@ Fields labeled as **experimental** are subject to change and not yet formally ad
             *   [TripDescriptor](#message-tripdescriptor)
                 *   [ScheduleRelationship](#enum-schedulerelationship-1)
             *   [VehicleDescriptor](#message-vehicledescriptor)
+                *   [WheelchairAccessible](#enum-wheelchairaccessible)
             *   [StopTimeUpdate](#message-stoptimeupdate)
                 *   [StopTimeEvent](#message-stoptimeevent)
                 *   [ScheduleRelationship](#enum-schedulerelationship)
@@ -55,6 +56,7 @@ Fields labeled as **experimental** are subject to change and not yet formally ad
             *   [TripDescriptor](#message-tripdescriptor)
                 *   [ScheduleRelationship](#enum-schedulerelationship-1)
             *   [VehicleDescriptor](#message-vehicledescriptor)
+                *   [WheelchairAccessible](#enum-wheelchairaccessible)
             *   [Position](#message-position)
             *   [VehicleStopStatus](#enum-vehiclestopstatus)
             *   [CongestionLevel](#enum-congestionlevel)
@@ -474,6 +476,20 @@ Identification information for the vehicle performing the trip.
 | **id** | [string](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Optional | One | Internal system identification of the vehicle. Should be **unique** per vehicle, and is used for tracking the vehicle as it proceeds through the system. This id should not be made visible to the end-user; for that purpose use the **label** field |
 | **label** | [string](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Optional | One | User visible label, i.e., something that must be shown to the passenger to help identify the correct vehicle. |
 | **license_plate** | [string](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Optional | One | The license plate of the vehicle. |
+| **wheelchair_accessible** | [WheelchairAccessible](#enum-wheelchairaccessible) | Optional | One | If provided, can overwrite the *wheelchair_accessible* value from the static GTFS. |
+
+## _enum_ WheelchairAccessible
+
+If a particuliar trip is accessible to wheelchair. When available, this value should overwrite the _wheelchair_accessible_ value from the static GTFS.
+
+#### Values
+
+| _**Value**_ | _**Comment**_ |
+|-------------|---------------|
+| **NO_VALUE** | The trip doesn't have information about wheelchair accessibility. This is the **default** behavior. If the static GTFS contains a _wheelchair_accessible_ value, it won't be overwritten. |
+| **UNKNOWN** | The trip has no accessibility value present. This value will overwrite the value from the GTFS.  |
+| **WHEELCHAIR_ACCESSIBLE** | The trip is wheelchair accessible. This value will overwrite the value from the GTFS. |
+| **WHEELCHAIR_INACCESSIBLE** | The trip is **not** wheelchair accessible. This value will overwrite the value from the GTFS. |
 
 ## _message_ EntitySelector