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In page Roman roads:

"

Roman road builders aimed at a regulation width (see Laws and traditions above), but actual widths have been measured at between 3.6 feet (1.1 metres) and more than 23 feet (7.0 metres). Today, the concrete has worn from the spaces around the stones, giving the impression of a very bumpy road, but the original practice was to produce a surface that was no doubt much closer to being flat.[citation needed] Many roads were built to resist rain, freezing and flooding. They were constructed to need as little repair as possible.[citation needed]