示例#1
0
/** Find any safe and free tile. */
static int32 NPFFindSafeTile(AyStar *as, OpenListNode *current)
{
	const Train *v = Train::From(((NPFFindStationOrTileData *)as->user_target)->v);

	return (IsSafeWaitingPosition(v, current->path.node.tile, current->path.node.direction, true, _settings_game.pf.forbid_90_deg) &&
			IsWaitingPositionFree(v, current->path.node.tile, current->path.node.direction, _settings_game.pf.forbid_90_deg)) ?
				AYSTAR_FOUND_END_NODE : AYSTAR_DONE;
}
示例#2
0
文件: npf.cpp 项目: andrew889/OpenTTD
/**
 * To be called when @p current contains the (shortest route to) the target node.
 * Will fill the contents of the NPFFoundTargetData using
 * AyStarNode[NPF_TRACKDIR_CHOICE]. If requested, path reservation
 * is done here.
 */
static void NPFSaveTargetData(AyStar *as, OpenListNode *current)
{
	NPFFoundTargetData *ftd = (NPFFoundTargetData*)as->user_path;
	ftd->best_trackdir = (Trackdir)current->path.node.user_data[NPF_TRACKDIR_CHOICE];
	ftd->best_path_dist = current->g;
	ftd->best_bird_dist = 0;
	ftd->node = current->path.node;
	ftd->res_okay = false;

	if (as->user_target != NULL && ((NPFFindStationOrTileData*)as->user_target)->reserve_path && as->user_data[NPF_TYPE] == TRANSPORT_RAIL) {
		/* Path reservation is requested. */
		const Train *v = Train::From(((NPFFindStationOrTileData *)as->user_target)->v);

		const PathNode *target = FindSafePosition(&current->path, v);
		ftd->node = target->node;

		/* If the target is a station skip to platform end. */
		if (IsRailStationTile(target->node.tile)) {
			DiagDirection dir = TrackdirToExitdir(target->node.direction);
			uint len = Station::GetByTile(target->node.tile)->GetPlatformLength(target->node.tile, dir);
			TileIndex end_tile = TILE_ADD(target->node.tile, (len - 1) * TileOffsByDiagDir(dir));

			/* Update only end tile, trackdir of a station stays the same. */
			ftd->node.tile = end_tile;
			if (!IsWaitingPositionFree(v, end_tile, target->node.direction, _settings_game.pf.forbid_90_deg)) return;
			SetRailStationPlatformReservation(target->node.tile, dir, true);
			SetRailStationReservation(target->node.tile, false);
		} else {
			if (!IsWaitingPositionFree(v, target->node.tile, target->node.direction, _settings_game.pf.forbid_90_deg)) return;
		}

		for (const PathNode *cur = target; cur->parent != NULL; cur = cur->parent) {
			if (!TryReserveRailTrack(cur->node.tile, TrackdirToTrack(cur->node.direction))) {
				/* Reservation failed, undo. */
				ClearPathReservation(target, cur);
				return;
			}
		}

		ftd->res_okay = true;
	}
}
示例#3
0
文件: npf.cpp 项目: andrew889/OpenTTD
/* Determine the cost of this node, for railway tracks */
static int32 NPFRailPathCost(AyStar *as, AyStarNode *current, OpenListNode *parent)
{
	TileIndex tile = current->tile;
	Trackdir trackdir = current->direction;
	int32 cost = 0;
	/* HACK: We create a OpenListNode manually, so we can call EndNodeCheck */
	OpenListNode new_node;

	/* Determine base length */
	switch (GetTileType(tile)) {
		case MP_TUNNELBRIDGE:
			cost = IsTunnel(tile) ? NPFTunnelCost(current) : NPFBridgeCost(current);
			break;

		case MP_RAILWAY:
			cost = _trackdir_length[trackdir]; // Should be different for diagonal tracks
			break;

		case MP_ROAD: // Railway crossing
			cost = NPF_TILE_LENGTH;
			break;

		case MP_STATION:
			/* We give a station tile a penalty. Logically we would only want to give
			 * station tiles that are not our destination this penalty. This would
			 * discourage trains to drive through busy stations. But, we can just
			 * give any station tile a penalty, because every possible route will get
			 * this penalty exactly once, on its end tile (if it's a station) and it
			 * will therefore not make a difference. */
			cost = NPF_TILE_LENGTH + _settings_game.pf.npf.npf_rail_station_penalty;

			if (IsRailWaypoint(tile)) {
				NPFFindStationOrTileData *fstd = (NPFFindStationOrTileData*)as->user_target;
				if (fstd->v->current_order.IsType(OT_GOTO_WAYPOINT) && GetStationIndex(tile) == fstd->v->current_order.GetDestination()) {
					/* This waypoint is our destination; maybe this isn't an unreserved
					 * one, so check that and if so see that as the last signal being
					 * red. This way waypoints near stations should work better. */
					const Train *train = Train::From(fstd->v);
					CFollowTrackRail ft(train);
					TileIndex t = tile;
					Trackdir td = trackdir;
					while (ft.Follow(t, td)) {
						assert(t != ft.m_new_tile);
						t = ft.m_new_tile;
						if (KillFirstBit(ft.m_new_td_bits) != TRACKDIR_BIT_NONE) {
							/* We encountered a junction; it's going to be too complex to
							 * handle this perfectly, so just bail out. There is no simple
							 * free path, so try the other possibilities. */
							td = INVALID_TRACKDIR;
							break;
						}
						td = RemoveFirstTrackdir(&ft.m_new_td_bits);
						/* If this is a safe waiting position we're done searching for it */
						if (IsSafeWaitingPosition(train, t, td, true, _settings_game.pf.forbid_90_deg)) break;
					}
					if (td == INVALID_TRACKDIR ||
							!IsSafeWaitingPosition(train, t, td, true, _settings_game.pf.forbid_90_deg) ||
							!IsWaitingPositionFree(train, t, td, _settings_game.pf.forbid_90_deg)) {
						cost += _settings_game.pf.npf.npf_rail_lastred_penalty;
					}
				}
			}
			break;

		default:
			break;
	}

	/* Determine extra costs */

	/* Check for signals */
	if (IsTileType(tile, MP_RAILWAY)) {
		if (HasSignalOnTrackdir(tile, trackdir)) {
			SignalType sigtype = GetSignalType(tile, TrackdirToTrack(trackdir));
			/* Ordinary track with signals */
			if (GetSignalStateByTrackdir(tile, trackdir) == SIGNAL_STATE_RED) {
				/* Signal facing us is red */
				if (!NPFGetFlag(current, NPF_FLAG_SEEN_SIGNAL)) {
					/* Penalize the first signal we
					 * encounter, if it is red */

					/* Is this a presignal exit or combo? */
					if (!IsPbsSignal(sigtype)) {
						if (sigtype == SIGTYPE_EXIT || sigtype == SIGTYPE_COMBO) {
							/* Penalise exit and combo signals differently (heavier) */
							cost += _settings_game.pf.npf.npf_rail_firstred_exit_penalty;
						} else {
							cost += _settings_game.pf.npf.npf_rail_firstred_penalty;
						}
					}
				}
				/* Record the state of this signal */
				NPFSetFlag(current, NPF_FLAG_LAST_SIGNAL_RED, true);
			} else {
				/* Record the state of this signal */
				NPFSetFlag(current, NPF_FLAG_LAST_SIGNAL_RED, false);
			}
			if (NPFGetFlag(current, NPF_FLAG_SEEN_SIGNAL)) {
				if (NPFGetFlag(current, NPF_FLAG_2ND_SIGNAL)) {
					NPFSetFlag(current, NPF_FLAG_3RD_SIGNAL, true);
				} else {
					NPFSetFlag(current, NPF_FLAG_2ND_SIGNAL, true);
				}
			} else {
				NPFSetFlag(current, NPF_FLAG_SEEN_SIGNAL, true);
			}
			NPFSetFlag(current, NPF_FLAG_LAST_SIGNAL_BLOCK, !IsPbsSignal(sigtype));
		}

		if (HasPbsSignalOnTrackdir(tile, ReverseTrackdir(trackdir)) && !NPFGetFlag(current, NPF_FLAG_3RD_SIGNAL)) {
			cost += _settings_game.pf.npf.npf_rail_pbs_signal_back_penalty;
		}
	}

	/* Penalise the tile if it is a target tile and the last signal was
	 * red */
	/* HACK: We create a new_node here so we can call EndNodeCheck. Ugly as hell
	 * of course... */
	new_node.path.node = *current;
	if (as->EndNodeCheck(as, &new_node) == AYSTAR_FOUND_END_NODE && NPFGetFlag(current, NPF_FLAG_LAST_SIGNAL_RED))
		cost += _settings_game.pf.npf.npf_rail_lastred_penalty;

	/* Check for slope */
	cost += NPFSlopeCost(current);

	/* Check for turns */
	if (current->direction != NextTrackdir((Trackdir)parent->path.node.direction))
		cost += _settings_game.pf.npf.npf_rail_curve_penalty;
	/* TODO, with realistic acceleration, also the amount of straight track between
	 *      curves should be taken into account, as this affects the speed limit. */

	/* Check for reverse in depot */
	if (IsRailDepotTile(tile) && as->EndNodeCheck(as, &new_node) != AYSTAR_FOUND_END_NODE) {
		/* Penalise any depot tile that is not the last tile in the path. This
		 * _should_ penalise every occurence of reversing in a depot (and only
		 * that) */
		cost += _settings_game.pf.npf.npf_rail_depot_reverse_penalty;
	}

	/* Check for occupied track */
	cost += NPFReservedTrackCost(current);

	NPFMarkTile(tile);
	DEBUG(npf, 4, "Calculating G for: (%d, %d). Result: %d", TileX(current->tile), TileY(current->tile), cost);
	return cost;
}
示例#4
0
	/**
	 * Called by YAPF to calculate the cost from the origin to the given node.
	 *  Calculates only the cost of given node, adds it to the parent node cost
	 *  and stores the result into Node::m_cost member
	 */
	inline bool PfCalcCost(Node &n, const TrackFollower *tf)
	{
		assert(!n.flags_u.flags_s.m_targed_seen);
		assert(tf->m_new_tile == n.m_key.m_tile);
		assert((TrackdirToTrackdirBits(n.m_key.m_td) & tf->m_new_td_bits) != TRACKDIR_BIT_NONE);

		CPerfStart perf_cost(Yapf().m_perf_cost);

		/* Does the node have some parent node? */
		bool has_parent = (n.m_parent != NULL);

		/* Do we already have a cached segment? */
		CachedData &segment = *n.m_segment;
		bool is_cached_segment = (segment.m_cost >= 0);

		int parent_cost = has_parent ? n.m_parent->m_cost : 0;

		/* Each node cost contains 2 or 3 main components:
		 *  1. Transition cost - cost of the move from previous node (tile):
		 *    - curve cost (or zero for straight move)
		 *  2. Tile cost:
		 *    - base tile cost
		 *      - YAPF_TILE_LENGTH for diagonal tiles
		 *      - YAPF_TILE_CORNER_LENGTH for non-diagonal tiles
		 *    - tile penalties
		 *      - tile slope penalty (upward slopes)
		 *      - red signal penalty
		 *      - level crossing penalty
		 *      - speed-limit penalty (bridges)
		 *      - station platform penalty
		 *      - penalty for reversing in the depot
		 *      - etc.
		 *  3. Extra cost (applies to the last node only)
		 *    - last red signal penalty
		 *    - penalty for too long or too short platform on the destination station
		 */
		int transition_cost = 0;
		int extra_cost = 0;

		/* Segment: one or more tiles connected by contiguous tracks of the same type.
		 * Each segment cost includes 'Tile cost' for all its tiles (including the first
		 * and last), and the 'Transition cost' between its tiles. The first transition
		 * cost of segment entry (move from the 'parent' node) is not included!
		 */
		int segment_entry_cost = 0;
		int segment_cost = 0;

		const Train *v = Yapf().GetVehicle();

		/* start at n.m_key.m_tile / n.m_key.m_td and walk to the end of segment */
		TILE cur(n.m_key.m_tile, n.m_key.m_td);

		/* the previous tile will be needed for transition cost calculations */
		TILE prev = !has_parent ? TILE() : TILE(n.m_parent->GetLastTile(), n.m_parent->GetLastTrackdir());

		EndSegmentReasonBits end_segment_reason = ESRB_NONE;

		TrackFollower tf_local(v, Yapf().GetCompatibleRailTypes(), &Yapf().m_perf_ts_cost);

		if (!has_parent) {
			/* We will jump to the middle of the cost calculator assuming that segment cache is not used. */
			assert(!is_cached_segment);
			/* Skip the first transition cost calculation. */
			goto no_entry_cost;
		}

		for (;;) {
			/* Transition cost (cost of the move from previous tile) */
			transition_cost = Yapf().CurveCost(prev.td, cur.td);
			transition_cost += Yapf().SwitchCost(prev.tile, cur.tile, TrackdirToExitdir(prev.td));

			/* First transition cost counts against segment entry cost, other transitions
			 * inside segment will come to segment cost (and will be cached) */
			if (segment_cost == 0) {
				/* We just entered the loop. First transition cost goes to segment entry cost)*/
				segment_entry_cost = transition_cost;
				transition_cost = 0;

				/* It is the right time now to look if we can reuse the cached segment cost. */
				if (is_cached_segment) {
					/* Yes, we already know the segment cost. */
					segment_cost = segment.m_cost;
					/* We know also the reason why the segment ends. */
					end_segment_reason = segment.m_end_segment_reason;
					/* We will need also some information about the last signal (if it was red). */
					if (segment.m_last_signal_tile != INVALID_TILE) {
						assert(HasSignalOnTrackdir(segment.m_last_signal_tile, segment.m_last_signal_td));
						SignalState sig_state = GetSignalStateByTrackdir(segment.m_last_signal_tile, segment.m_last_signal_td);
						bool is_red = (sig_state == SIGNAL_STATE_RED);
						n.flags_u.flags_s.m_last_signal_was_red = is_red;
						if (is_red) {
							n.m_last_red_signal_type = GetSignalType(segment.m_last_signal_tile, TrackdirToTrack(segment.m_last_signal_td));
						}
					}
					/* No further calculation needed. */
					cur = TILE(n.GetLastTile(), n.GetLastTrackdir());
					break;
				}
			} else {
				/* Other than first transition cost count as the regular segment cost. */
				segment_cost += transition_cost;
			}

no_entry_cost: // jump here at the beginning if the node has no parent (it is the first node)

			/* All other tile costs will be calculated here. */
			segment_cost += Yapf().OneTileCost(cur.tile, cur.td);

			/* If we skipped some tunnel/bridge/station tiles, add their base cost */
			segment_cost += YAPF_TILE_LENGTH * tf->m_tiles_skipped;

			/* Slope cost. */
			segment_cost += Yapf().SlopeCost(cur.tile, cur.td);

			/* Signal cost (routine can modify segment data). */
			segment_cost += Yapf().SignalCost(n, cur.tile, cur.td);

			/* Reserved tiles. */
			segment_cost += Yapf().ReservationCost(n, cur.tile, cur.td, tf->m_tiles_skipped);

			end_segment_reason = segment.m_end_segment_reason;

			/* Tests for 'potential target' reasons to close the segment. */
			if (cur.tile == prev.tile) {
				/* Penalty for reversing in a depot. */
				assert(IsRailDepot(cur.tile));
				segment_cost += Yapf().PfGetSettings().rail_depot_reverse_penalty;
				/* We will end in this pass (depot is possible target) */
				end_segment_reason |= ESRB_DEPOT;

			} else if (cur.tile_type == MP_STATION && IsRailWaypoint(cur.tile)) {
				if (v->current_order.IsType(OT_GOTO_WAYPOINT) &&
						GetStationIndex(cur.tile) == v->current_order.GetDestination() &&
						!Waypoint::Get(v->current_order.GetDestination())->IsSingleTile()) {
					/* This waypoint is our destination; maybe this isn't an unreserved
					 * one, so check that and if so see that as the last signal being
					 * red. This way waypoints near stations should work better. */
					CFollowTrackRail ft(v);
					TileIndex t = cur.tile;
					Trackdir td = cur.td;
					while (ft.Follow(t, td)) {
						assert(t != ft.m_new_tile);
						t = ft.m_new_tile;
						if (KillFirstBit(ft.m_new_td_bits) != TRACKDIR_BIT_NONE) {
							/* We encountered a junction; it's going to be too complex to
							 * handle this perfectly, so just bail out. There is no simple
							 * free path, so try the other possibilities. */
							td = INVALID_TRACKDIR;
							break;
						}
						td = RemoveFirstTrackdir(&ft.m_new_td_bits);
						/* If this is a safe waiting position we're done searching for it */
						if (IsSafeWaitingPosition(v, t, td, true, _settings_game.pf.forbid_90_deg)) break;
					}

					/* In the case this platform is (possibly) occupied we add penalty so the
					 * other platforms of this waypoint are evaluated as well, i.e. we assume
					 * that there is a red signal in the waypoint when it's occupied. */
					if (td == INVALID_TRACKDIR ||
							!IsSafeWaitingPosition(v, t, td, true, _settings_game.pf.forbid_90_deg) ||
							!IsWaitingPositionFree(v, t, td, _settings_game.pf.forbid_90_deg)) {
						extra_cost += Yapf().PfGetSettings().rail_lastred_penalty;
					}
				}
				/* Waypoint is also a good reason to finish. */
				end_segment_reason |= ESRB_WAYPOINT;

			} else if (tf->m_is_station) {
				/* Station penalties. */
				uint platform_length = tf->m_tiles_skipped + 1;
				/* We don't know yet if the station is our target or not. Act like
				 * if it is pass-through station (not our destination). */
				segment_cost += Yapf().PfGetSettings().rail_station_penalty * platform_length;
				/* We will end in this pass (station is possible target) */
				end_segment_reason |= ESRB_STATION;

			} else if (TrackFollower::DoTrackMasking() && cur.tile_type == MP_RAILWAY) {
				/* Searching for a safe tile? */
				if (HasSignalOnTrackdir(cur.tile, cur.td) && !IsPbsSignal(GetSignalType(cur.tile, TrackdirToTrack(cur.td)))) {
					end_segment_reason |= ESRB_SAFE_TILE;
				}
			}

			/* Apply min/max speed penalties only when inside the look-ahead radius. Otherwise
			 * it would cause desync in MP. */
			if (n.m_num_signals_passed < m_sig_look_ahead_costs.Size())
			{
				int min_speed = 0;
				int max_speed = tf->GetSpeedLimit(&min_speed);
				int max_veh_speed = v->GetDisplayMaxSpeed();
				if (max_speed < max_veh_speed) {
					extra_cost += YAPF_TILE_LENGTH * (max_veh_speed - max_speed) * (4 + tf->m_tiles_skipped) / max_veh_speed;
				}
				if (min_speed > max_veh_speed) {
					extra_cost += YAPF_TILE_LENGTH * (min_speed - max_veh_speed);
				}
			}

			/* Finish if we already exceeded the maximum path cost (i.e. when
			 * searching for the nearest depot). */
			if (m_max_cost > 0 && (parent_cost + segment_entry_cost + segment_cost) > m_max_cost) {
				end_segment_reason |= ESRB_PATH_TOO_LONG;
			}

			/* Move to the next tile/trackdir. */
			tf = &tf_local;
			tf_local.Init(v, Yapf().GetCompatibleRailTypes(), &Yapf().m_perf_ts_cost);

			if (!tf_local.Follow(cur.tile, cur.td)) {
				assert(tf_local.m_err != TrackFollower::EC_NONE);
				/* Can't move to the next tile (EOL?). */
				if (tf_local.m_err == TrackFollower::EC_RAIL_TYPE) {
					end_segment_reason |= ESRB_RAIL_TYPE;
				} else {
					end_segment_reason |= ESRB_DEAD_END;
				}

				if (TrackFollower::DoTrackMasking() && !HasOnewaySignalBlockingTrackdir(cur.tile, cur.td)) {
					end_segment_reason |= ESRB_SAFE_TILE;
				}
				break;
			}

			/* Check if the next tile is not a choice. */
			if (KillFirstBit(tf_local.m_new_td_bits) != TRACKDIR_BIT_NONE) {
				/* More than one segment will follow. Close this one. */
				end_segment_reason |= ESRB_CHOICE_FOLLOWS;
				break;
			}

			/* Gather the next tile/trackdir/tile_type/rail_type. */
			TILE next(tf_local.m_new_tile, (Trackdir)FindFirstBit2x64(tf_local.m_new_td_bits));

			if (TrackFollower::DoTrackMasking() && IsTileType(next.tile, MP_RAILWAY)) {
				if (HasSignalOnTrackdir(next.tile, next.td) && IsPbsSignal(GetSignalType(next.tile, TrackdirToTrack(next.td)))) {
					/* Possible safe tile. */
					end_segment_reason |= ESRB_SAFE_TILE;
				} else if (HasSignalOnTrackdir(next.tile, ReverseTrackdir(next.td)) && GetSignalType(next.tile, TrackdirToTrack(next.td)) == SIGTYPE_PBS_ONEWAY) {
					/* Possible safe tile, but not so good as it's the back of a signal... */
					end_segment_reason |= ESRB_SAFE_TILE | ESRB_DEAD_END;
					extra_cost += Yapf().PfGetSettings().rail_lastred_exit_penalty;
				}
			}

			/* Check the next tile for the rail type. */
			if (next.rail_type != cur.rail_type) {
				/* Segment must consist from the same rail_type tiles. */
				end_segment_reason |= ESRB_RAIL_TYPE;
				break;
			}

			/* Avoid infinite looping. */
			if (next.tile == n.m_key.m_tile && next.td == n.m_key.m_td) {
				end_segment_reason |= ESRB_INFINITE_LOOP;
				break;
			}

			if (segment_cost > s_max_segment_cost) {
				/* Potentially in the infinite loop (or only very long segment?). We should
				 * not force it to finish prematurely unless we are on a regular tile. */
				if (IsTileType(tf->m_new_tile, MP_RAILWAY)) {
					end_segment_reason |= ESRB_SEGMENT_TOO_LONG;
					break;
				}
			}

			/* Any other reason bit set? */
			if (end_segment_reason != ESRB_NONE) {
				break;
			}

			/* For the next loop set new prev and cur tile info. */
			prev = cur;
			cur = next;

		} // for (;;)

		bool target_seen = false;
		if ((end_segment_reason & ESRB_POSSIBLE_TARGET) != ESRB_NONE) {
			/* Depot, station or waypoint. */
			if (Yapf().PfDetectDestination(cur.tile, cur.td)) {
				/* Destination found. */
				target_seen = true;
			}
		}

		/* Update the segment if needed. */
		if (!is_cached_segment) {
			/* Write back the segment information so it can be reused the next time. */
			segment.m_cost = segment_cost;
			segment.m_end_segment_reason = end_segment_reason & ESRB_CACHED_MASK;
			/* Save end of segment back to the node. */
			n.SetLastTileTrackdir(cur.tile, cur.td);
		}

		/* Do we have an excuse why not to continue pathfinding in this direction? */
		if (!target_seen && (end_segment_reason & ESRB_ABORT_PF_MASK) != ESRB_NONE) {
			/* Reason to not continue. Stop this PF branch. */
			return false;
		}

		/* Special costs for the case we have reached our target. */
		if (target_seen) {
			n.flags_u.flags_s.m_targed_seen = true;
			/* Last-red and last-red-exit penalties. */
			if (n.flags_u.flags_s.m_last_signal_was_red) {
				if (n.m_last_red_signal_type == SIGTYPE_EXIT) {
					/* last signal was red pre-signal-exit */
					extra_cost += Yapf().PfGetSettings().rail_lastred_exit_penalty;
				} else if (!IsPbsSignal(n.m_last_red_signal_type)) {
					/* Last signal was red, but not exit or path signal. */
					extra_cost += Yapf().PfGetSettings().rail_lastred_penalty;
				}
			}

			/* Station platform-length penalty. */
			if ((end_segment_reason & ESRB_STATION) != ESRB_NONE) {
				const BaseStation *st = BaseStation::GetByTile(n.GetLastTile());
				assert(st != NULL);
				uint platform_length = st->GetPlatformLength(n.GetLastTile(), ReverseDiagDir(TrackdirToExitdir(n.GetLastTrackdir())));
				/* Reduce the extra cost caused by passing-station penalty (each station receives it in the segment cost). */
				extra_cost -= Yapf().PfGetSettings().rail_station_penalty * platform_length;
				/* Add penalty for the inappropriate platform length. */
				extra_cost += PlatformLengthPenalty(platform_length);
			}
		}

		/* total node cost */
		n.m_cost = parent_cost + segment_entry_cost + segment_cost + extra_cost;

		return true;
	}
示例#5
0
	/** Called by YAPF to detect if node ends in the desired destination */
	FORCEINLINE bool PfDetectDestination(TileIndex tile, Trackdir td)
	{
		return
			IsSafeWaitingPosition(Yapf().GetVehicle(), tile, td, true, !TrackFollower::Allow90degTurns()) &&
			IsWaitingPositionFree(Yapf().GetVehicle(), tile, td, !TrackFollower::Allow90degTurns());
	}