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How has the system of transportation evolved over the years? What costs have changed and why have they changed? What philosophies have guided its development? Have things been changing recently? How is this system likely to evolve in the coming years?

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How has the system of transportation evolved over the years?

What costs have changed and why have they changed?

What philosophies have guided its development? Have things been changing recently?

How is this system likely to evolve in the coming years?