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How many kilometres of stone-paved roads did the ancient Romans build?

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The answer

80,500 kilometres

Over 80,500 kilometres of stone paving, enough to circle the Earth twice.

How to get there

  1. 372 great roads
  2. × about 200 km average length (assumption) ≈ 74,400 km
  3. according to the source over 80,500 km were paved, about twice Earth's circumference

Source: Wikipedia: Roman roads, more than 400,000 km of roads, over 80,500 km stone-paved, 372 great roads

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