Everyone between the ages of 14-50 years, around the world should not be required to use bicycle as his or her main form (define) of transportation.
It would take longer for everyone to reach their destination when riding their bike rather that using a train/bus/car. It would all depend on how fast or slow you ride your bike and how far you have to travel. Everyone rides at their own pace. It would take especially brger for older people to ride their bike.
It would be tiredsome for one when riding the bike everywhere. If one had to get from point A to point B and if the distant is 10 miles, by the time you would get there, most people would not be able to walk. So even if you started out fast you would get tired and end up slowing down.
Consider the changing weather. How would you get anywhere on a bike if it is snowing or raining outside.
How would people in Alaska travel anywhere if there is snow all year long. If you would not have a car as a way out you would either walk or be stuck at one place even if you had a car as a way out, it would be like throwing your money out the window because you would have to pay insurance on something that you are not even using.
It would be dangerous because if you are on your bike and there is a truck next to you, since you are on your bike you will be easily missed because the bike is so little. You could possiably get into an accident because you were in a blind spot of a trucker.
Everyone does not have the physical and mental ability to ride a bike. In mental ability, consider if someone who is mentally disabled or disturbed , they will not know right from wrong. In which case they could hurt themselves or someone else. In physical abilities, if someone is missing fingers on one hand they will not be able to squeeze the brakes, which means they will not be able to stop, this could lead to an accident.
What about when you go to work? They will be tired from riding their bike if they have a meeting with their boss, the employee is not going to come in shorts, he will probably wear a suit and tie. How are you suppose to ride your bike in a suit? For women it will be even harder because if they wear a skirt, how will they move their legs? So if this was the way to go people would have to carry extra cloths, one to wear while riding their bike and one while at work.
Riding your bike could lead to health problems at a later age. If you are bending your back to reach the handles your back is constantly arched all the time, which could possibly lead to humps or lower back problems. Since you will constantly be using your ankles to ride the bike, what about arthritis? When you get older you will not be able to walk because of the over usage of your ankles.