After a year of early mornings, Hans had his photos, and left the motorcycle transports of Vietnam to go about their business unharassed. But it's a business that's in transition. In the few years that have passed since Kemp took these pictures, Vietnam has adopted a helmet law, so skid lids have replaced the baseball caps and jaunty headwear you see in these photos. And increasing affluence in Vietnam means that there are more refrigerators, wider roads and less fresh market shopping going on every day. Cars and trucks are becoming more common, and the motorcycle as do-it-all delivery vehicle is destined to gradually fade out. The change should make life a little safer on the streets of Vietnam-but a lot less interesting to watch.