Personal Freedom, or Cleaner Air?

In an effort to cut air pollution in Beijing in preparation for the Olympic Games, China’s Environmental Protection Bureau experimented with a traffic ban. From August 17 to 20, drivers were kept off the roads. Those with odd numbered plates did not drive on two of the days, and those with even numbered plates on the other two. Taxis, buses, and emergency vehicles were exempt from the ban. The result, according to China.org.cn, was 1/3 fewer vehicles on the roads and a significant drop in the pollution index. Pleased citizens urged further bans, a move understandably opposed by a majority of car owners. One month later, the government proclaimed a "green traffic week" urging car owners in 108 cities to walk, bike, or use public transportation. Sections of the cities were closed to vehicle traffic. The week was success in easing traffic congestion and lowering pollution levels, and will be an annual event. Given the results of the experiments, do you think the government should impose more bans, or should they focus on encouraging voluntary use of other transportation?