>But start bringing in cars and trucks and see it crumble in a week There are some Roman bridges that still get automobile traffic (Römerbrücke, Puente Alcánta

>But start bringing in cars and trucks and see it crumble in a week There are some Roman bridges that still get automobile traffic (Römerbrücke, Puente Alcántara) or were only recently pedestrianized (Puente Romano). There are more probably, that's just what I found after skimming some Wikipedia pages. https://en.wikipedia.org/wiki/Roman_bridge https://en.wikipedia.org/wiki/Roman_bridge