I think the use of cars should be limited by law. Although the use of cars brings us lots of convenience, it also brings car accidents which caused lots of people's death. The air pollution is also worse because of the use of cars.
For short journeys, We'd better go on foot or by bike. Because we can enjoy the beauty of the nature,and is also good for our health.
For long journeys, if you have enough time, you can go by train. That is fast and can also save a lot of money. If you have enough money, you can go by plain. Because it can save a lot of time.
