According to my experience , I would say China . I have been most countries in Asia and I don't want to drive in China . They  don't yield and they try to make 3 lanes out of two lanes street and they don't stop for ped and blow a lot of horn . Second is India or Pakistan.

Jakatar and Bangkok probably the worst in Asia

I have been to Bangkok. It's not that bad. I never had experience on the trafic jam too much. I only take Sky train or Subway so it's the most convinience to travel in the downtown during the peak hours.

The wost that I have seen was in Hanoi and in Phom Penh, they any how dive and beep beep all the time. it was very noisy.

Anyway...The roads in these country whatever in Indonesia Thailand or Philippines are better condition than us.

Even in LA or in NY also worst jam

Why we always compare that country this country but we never look at ourself.....sigh!!!!

japan still have traffic jam.go to chiba from tokyo during week end.you will know what happen,I thing laos better.becouse you have not much cars and roads.still jungle country and probably still have dinosaurus or T rex over there. compare to thailan.indonesia.and philipine. laos nothing,still long time to go to reach them.