It is because a lot of rain fall each year, and the transportation system design with lane for buses, especially to reduce the traffic jam on the streets and reduce pollution to the air, too.
Because a lot of rain falls each year, and designed to transport lanes for buses only. To alleviate the traffic congestion on the roads and reduce emissions into the air as well.
Because of rain fall each year, and many design system to have for the car ประจำทาง especially. In order to reduce traffic congestion on the road and reduce the pollution to the air, too!