Where can the pedestrians walk?

Unfortunately we live in a civilization that is made of the  blocks and the metals. It is full of the cars and buildings. Many times, we have to strive even to  walk on the street among  these.
I think, if one day a new world war starts, it will be due to park problem.
Everyday in Istanbul, the 700 new cars hit the roads.
The transportation is also a big problem in  the cities, of course in Istanbul. For the short distances the bikes may be a solution.
The mass transport is not well designed and very crowded, also is being more expensive  day by day.
I do not know where the pedestrians can walk on but if they wish, they  can walk on the clouds like me believing in the bicycle transportation in the city.