SELECT round(avg(c.AVG_DELAY_TIME)) as AVG_DELAY FROM `result_road_saturation_day` a LEFT JOIN info_road_area d ON a.ROAD_CODE=d.ROAD_CODE LEFT JOIN info_area e ON e.AREA_CODE=d.AREA_CODE LEFT JOIN result_road_delay_day c ON a.ROAD_CODE=c.ROAD_CODE <…