I already know some answers to my question but would be interested to hear others' views and experiences with the rules here and police. When I first came to Vietnam I was amused that the biggest bikes commonly available were 125 or 135; nowadays I'm quite happy with my PCX 135, I am an old, big belly guy and my Honda can accelerate fast enough to dump my passenger. In Canada I drive at 100kmh+ but here I'm happy at 60 on the highway even though I get an occasional ticket. Here we have to contend with drivers who don't signal, ride at night with no lights and many other hazards peculiar to Vietnam. One thing I like, unlike in Canada and the US is car drivers are aware of motorbikes.