First of all to imform fellow citizens about the advantage of limited car usage.'' as a result,70 percernt of vaubans families do not own car and 57 percent sold a car to move here''.''Automobiles are the linchpin of suburbs where middle- families from chicago to shanghai tend to make their home''.and '' passenger car are responsible for 12 percent of greenhouse gas emissions in europe. and up to 50 percent in some car-intensive area in the united state''.

Second of all,''while there have been effort in the past two decades to make cities denser, and better for walking, planners are now taking the concept to the suburbs. vauban,home to 5,500 resident within a rectangular square mile,may be the most advanced experiment in low-car suburban life''.

Finally there are some county and city tht have higher cost of the gasoline and some county and city have lower cost but evrything it different in all the world. paris typically has more smog than other european capital.''president obama's ambitious goal to curb the united state greendhouse gas emissiom, unveiled las week,will get a fortuitous. that what i think advantage of limited car like i said every city and county are different and have different cost.