Bicycle are popular today in many countries. Many people use bicycles for exercise, but exercise is only one of the reasons why bicycles are popular. Another reason is money. Bicycles are not expensive to buy. They do not need gas to make them go. They are easy and cheap to fix. In cities many people like bicycles better then cars. With a bicycle, they never have to wait in traffic. They also do not have to find a place to park. Finally, bicycles do not cause any pollution!