That explains...

As I sit at the roadside food stall that is responsible for feeding us, traffic floods by on the busy street. Many of the passengers on the buses(public), tuk tuks, pickup taxis, motorcycles and bicycles are students. It is easy to tell that they are students because they are in uniform but there is a wide variety in the colors of those uniforms. There are blue, brown, red, yellow, black and green in various combinations. The girls are either in skirts or pants and the boys in shorts. The variety of uniforms shows that the students attend different schools.
My curiosity about all that student traffic was partially put to rest when I learned that there is a policy of open enrollment in Thailand. Any student can attend any public school. That explains the students movement in the morning. The other part of the equation is that the government provides no transportation. Families are responsible for that thus all the student movement morning and evening.