public static function getDirectionsStatus()
    {
        return array(
            self::INVALID_REQUEST,
            self::MAX_WAYPOINTS_EXCEEDED,
            self::NOT_FOUND,
            self::OK,
            self::OVER_QUERY_LIMIT,
            self::REQUEST_DENIED,
            self::UNKNOWN_ERROR,
            self::ZERO_RESULTS,
        );
    }