if there are only two sorts of transport-bicycle or car -which would you like better?why? Maybe ,it is diffcult to give an accurate
answer,because they have different effect,price,concerience and others. After comparing them ,you could choose a better one which is more suitable for you .
            One important difference is their effect. the condition of air and traffic is mostly based on the vehicle which people choose to use .Considering that,many people will choose the one which helps protect the enviroment .Compared with the car ,bicycle never expels the exhaust which is bad for air . on the contray, the exhaust that car expel is bad for the air . And the volume of cars leads to traffic jam,which bicycles don't.