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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