text: It is illegal to even test computer driven cars, not all states are willing to follow through with allowing it. It would take a long time to try and get all states on board with the situation. If the traffic laws change, new laws will be needed in order to cover liability in the case of an accciden, which will also take even more time to come up with those laws and get them passed. Even though the passages state that the Driverless Cars would in the long run be less money, It will be more money to construct the whole thing and make sure they all are trust worthy. So the quesion is, can we really trust "Driverless Cars"? Limiting care usage is an advantage because some people were always tense when they had a car and now they're saying they're much happier without it. Vauban is an example of a growing trend in Europe, the United States and elsewhere to seperate suburban life from auto use, as a component of a movement called "smart planning". Automobiles are the linchpin of suburbs, where middle-class families from Chicago to Shanghai tend to make their homes. And that, experts say, is a huge impediment to current efforts to drastically reduce greenhouse gas emissions tailpipes.. Passenger cars are responsible for 12% of greenhouse gas emissions in Europe, and 50% in some car-intensive areas in the United States.