diff --git a/src/vehicle.h b/src/vehicle.h
--- a/src/vehicle.h
+++ b/src/vehicle.h
@@ -7,6 +7,26 @@
 #include "order.h"
 #include "rail.h"
 
+/** The returned bits of VehicleEnterTile. */
+enum VehicleEnterTileStatus {
+	VETS_ENTERED_STATION  = 1, ///< The vehicle entered a station
+	VETS_ENTERED_WORMHOLE = 2, ///< The vehicle either entered a bridge, tunnel or depot tile (this includes the last tile of the bridge/tunnel)
+	VETS_CANNOT_ENTER     = 3, ///< The vehicle cannot enter the tile
+
+	/**
+	 * Shift the VehicleEnterTileStatus this many bits
+	 * to the right to get the station ID when
+	 * VETS_ENTERED_STATION is set
+	 */
+	VETS_STATION_ID_OFFSET = 8,
+
+	/** Bit sets of the above specified bits */
+	VETSB_CONTINUE         = 0,                          ///< The vehicle can continue normally
+	VETSB_ENTERED_STATION  = 1 << VETS_ENTERED_STATION,  ///< The vehicle entered a station
+	VETSB_ENTERED_WORMHOLE = 1 << VETS_ENTERED_WORMHOLE, ///< The vehicle either entered a bridge, tunnel or depot tile (this includes the last tile of the bridge/tunnel)
+	VETSB_CANNOT_ENTER     = 1 << VETS_CANNOT_ENTER,     ///< The vehicle cannot enter the tile
+};
+
 enum {
 	VEH_Train,
 	VEH_Road,