1. When a city has a population exceeding 1 million people, necessarily consider investing public transport to ensure the movement of people in the mode of transport chosen as appropriate: bus , taxi, tram (tramway), vehicles running on rails in the floor (monorail or sky-train) and subway system (Metro or subway). Metro is just economic methods, the most popular medium in the big cities, populous.
2. When urban roads are overloaded, not enough for commuter transport, then expand the space necessary to add sugar, set the interchange could, without land or premises, the building restrictions system beyond the high street.
3. To cope with population growth in the urban population can not tolerate more or landscape status quo of "historic city" to preserve, museum, people often build some urban Satellite to relax people.
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