Yes i stay long in Indonesia on anf off. "unwritten traffic rules??". Haha, the only rule when you win a case after and accident is MONEY. There are no traffic rules that people know. people buy their driving licences, they do not get any tests. This chaos is what you can see in this blog , if you say it is not then you are sleeping. The problem is people that do not want to admit that the traffic has a big problem in Indonesia, as in many other peoples that people should face and not hide.