Street Saigon, Vietnam
Vietnam has a lot of motorbikes, and by that I mean a LOT of motorbikes. They are everywhere and constitute the vast majority of traffic, even on rural roads. Most of the informal traffic rules tend to revolve around getting by motorbikes and the speed of traffic tends to be closer to motorbike speed than automobile speed. There is a lot a lot of honking in Vietnam. If you go more than a minute in a large city without hearing some horn honking, you are lucky.
Motorcycles are illegal in the Chinese city I live in. Good, yet bad. The cars are worse.