Roads are narrow. Just take a drive over to that area and you know what I am talking about.

weekday working hour jam, morning and evening different direction of congest, the reason of jam is,
1. road design, up down left right like snake.
2. there have 4project under construction, when lorry is there then very jam.
3. when public bus on the road, coz it will keep stopping for taking and putting passenger.

other than working hour, normally it still consider smooth