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function _SuperLib_Tile::GetBridgeAboveStart(tile, bridge_search_direction)
{
	if (!_SuperLib_Direction.IsMainDir(bridge_search_direction))
	{
		_SuperLib_Log.Error("Tile::GetBridgeAboveStart(tile, bridge_search_direction) was called with a non-main direction", _SuperLib_Log.LVL_INFO);
		return -1;
	}

	local max_height = AITile.GetMaxHeight(tile);

	for (local curr_tile = _SuperLib_Direction.GetAdjacentTileInDirection(tile, bridge_search_direction); 
			AIMap.IsValidTile(curr_tile); 
			curr_tile = _SuperLib_Direction.GetAdjacentTileInDirection(curr_tile, bridge_search_direction))
	{
		local curr_tile_height = AITile.GetMaxHeight(curr_tile);
		if (curr_tile_height < max_height)
		{
			// The down slope at the other side of a hill has been found -> There can't be a bridge to 'tile'.
			return -1;
		}

		max_height = Helper.Max(max_height, curr_tile_height);

		if (AIBridge.IsBridgeTile(curr_tile))
		{
			// A bridge was found
			
			// Check that the bridge goes in the right direction
			local other_end = AIBridge.GetOtherBridgeEnd(curr_tile);
			local found_bridge_dir = _SuperLib_Direction.GetDirectionToTile(curr_tile, other_end);

			// Return -1 if the bridge direction is wrong eg. 90 deg of bridge_search_direction or away from the tile 'tile'
			return found_bridge_dir == bridge_search_direction? curr_tile : -1;
		}
	}

	return -1;
}