diff --git a/src/vehicle_func.h b/src/vehicle_func.h
--- a/src/vehicle_func.h
+++ b/src/vehicle_func.h
@@ -28,10 +28,11 @@ const Vehicle *GetLastVehicleInChain(con
 uint CountVehiclesInChain(const Vehicle *v);
 bool IsEngineCountable(const Vehicle *v);
 void DeleteVehicleChain(Vehicle *v);
-Vehicle *VehicleFromPos(TileIndex tile, void *data, VehicleFromPosProc *proc);
-Vehicle *VehicleFromPosXY(int x, int y, void *data, VehicleFromPosProc *proc);
+void FindVehicleOnPos(TileIndex tile, void *data, VehicleFromPosProc *proc);
+void FindVehicleOnPosXY(int x, int y, void *data, VehicleFromPosProc *proc);
+bool HasVehicleOnPos(TileIndex tile, void *data, VehicleFromPosProc *proc);
+bool HasVehicleOnPosXY(int x, int y, void *data, VehicleFromPosProc *proc);
 void CallVehicleTicks();
-Vehicle *FindVehicleOnTileZ(TileIndex tile, byte z);
 uint8 CalcPercentVehicleFilled(const Vehicle *v, StringID *color);
 
 void InitializeTrains();
@@ -50,8 +51,7 @@ SpriteID GetRotorImage(const Vehicle *v)
 uint32 VehicleEnterTile(Vehicle *v, TileIndex tile, int x, int y);
 
 StringID VehicleInTheWayErrMsg(const Vehicle* v);
-Vehicle *FindVehicleBetween(TileIndex from, TileIndex to, byte z, bool without_crashed = false);
-Vehicle *GetVehicleTunnelBridge(TileIndex tile, TileIndex endtile);
+bool HasVehicleOnTunnelBridge(TileIndex tile, TileIndex endtile);
 
 void DecreaseVehicleValue(Vehicle *v);
 void CheckVehicleBreakdown(Vehicle *v);