Follow-up Comment #1, patch #4405 (project freeciv):
Don't know if it matters, but remember that it's not necessarily exactly "new
tech made one new road generally possible". Even classic ruleset has Bridge
Building technology that doesn't allow *new* road types, but one to build
existing roads on river tiles. In theory one could even get Railroad first (by
diplomacy or stealing) and then discovery of Bridge Building would give both
roads and railroads on river city centers.
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