A public has an opinion of not permitting private and public transports to enter the city centres and only environmentally friendly transports should be used such as bicycles. I would not support this idea , since public and private transports are much more comfortable rather than the bikes which take a lot of time to travel and the preferences of the men are different.
Nowadays in urban areas, we try to save even a minute.So we use more faster and cheaper ways of walking to a school or job. Even if the bikes are quite cheap, we do not prefer them, since we use energy instead. Spending of energy which can be used to calculating or thinking during a work time, may cause distraction and worse performing. For example Eshmat comes to the school by taxi every day, but his neighbor Toshmat uses bicycle, during the classes the former is active and full of energy while the letter is sleepy.
With respect to the men have limited abilities or illnesses such as asthma can not travel by bike. If we ban cars, they may not travel the hospital if needed. Since all of us are diiferent from each other, we have our own character or physical abilities are not the same. For instance My granddad sometimes get heart aches and he will not be able to travel to the hospital by bike, or the woman who has kid.
In conclusion, If someone likes to move by bike he or she can do so, but the others who do not have physical ability, should not suffer because of the decision he or she did.