By the end of the 2nd century CE (for over 5 centuries), Roman engineers built about 48,500 Roman miles (71,700 km) paved roads. Less than 100 years later, the inventory of Emperor Diocletian showed the existence of 372 roads in the area of the empire with a total length of 53,000 Roman miles (over 78.3 thousand km).
For comparison, the total length of highways in the USA is about 75,000 km.
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