As Tehran is the largest city in Iran by far, the transport challenges it faces therefore differ considerably from those faced by other Iranian cities. There are about 7 other major cities in Iran such as Tabriz and Isfahan (once one of the largest cities of the ancient world) but the difference between them and Tehran today is quite dramatic. This can be seen easily just by comparing their populations. They are all under 2 million while Tehran is four times their size. Thus, Tehran is the most densely populated urban area, and what goes on in Tehran will have an impact on transport nationally.
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