Ho Chi Man oh man there are a lot of motorbikes:

There are a few key differences between Japan and Vietnam, one is whether people will or will not pee in the streets. Another is the amount of motor bikes. Vietnam has more. Actually there are rivers of them. And this is one of my rare good analogies because these motor bikes tend not to follow any set lanes of traffic, more like currents. And there are no strictly enforced rules of the road, more like suggestions. And also if the road gets too packed it will often flood up onto the sidewalks.

In the US, a family of five will usually drive around in a minivan, or an SUV, but in Vietnam there is the motorbike. You can fit a family of five and several boxes and bags of groceries if you balance it just right. I think the Vietnamese people have balance in spades. (that means a lot of balance).