Any traveler to Vietnam knows a trip to the country is not complete until the traveler tries to cross a road. The streets are crowded with motorbikes moving at all different speeds, in both directions. It seems a major challenge for a walker. But one quickly learns that motorbike drivers will weave expertly around walkers. There is, in fact, some order to the seeming chaos of the streets. Vietnam is the land of the motorbike. Last year, Google Maps even created a feature for two-wheel commuters in the country. It provides trip times and road costs just for motorbikes. So can Vietnam's two biggest cities really ban the transport that its 100 million people depend on every day? City officials have proposed a motorbike ban in parts of Hanoi and Ho Chi Minh City. It is not the first time such an idea has been suggested. Similar proposals have come up over the years. The idea has led to a debate about pollution, traffic problems, city planning, and the fairest way to get people where they need to go.