In twenty years, there will be fewer cars in use than there are today Whether cars in use in the future will a boon or bane is still open to debate.But I believe there will be fewe cars in the future. The chief reason for this question is pollution. For one thing, today we have the biggest problem in the world is pollution. So the government will take some measures to reduce cars and will make the effort to encourage people to take public transportation such as buses, trains, airplane etc. For another, people in the future will care pollution much more than today, whatever development of education, technology or the sense of healthy will make people be more prefer public transportation rather than their own cars. Another factor that should be taken into account is traffic. Even-increasing people indicate even-increasing cars. In the first place, people hate congestion. So people will choose another vehicle thereby avoiding the traffic jam. Another reason is more and more cars on the road will be more complex in some situations. Therefore, we will work harder than today to get our driver's licenses. That means a lot. Some people will lazy to practice to get their licenses. Some will confuse when they are in the practice places. Some will fail to more strict exams. The result is a lot of people will be not able to get the licenses. In other words, the cars on the road will be fewer. A third argument that we should not neglect is efficiency. For instance, we want to go to New York when we are in Alabama. Nowadays, we may have two plans. Plan A is taking a plane and plan B is driving our own cars. If we want to go there for business, plan A will be our preference. But if we only want to there for vacation, we will choose plan B as we are able to enjoy the scene. In the future, that will be different. A company of Silicon Valley is working on the high-speed railway. It could speed up to 1000 kilometer per hours. What's more, we are able to enjoy the outside when we are in this railway. In another word, we will invent new vehicle with high speed, convenience, and comfort! So we will not hesitate in the future if we have two plans. Based on all those agreement, In twenty years, I argue that cars will be fewer., or better yet, we are able to take a personal plane in Uber!