Usually you need wider bridges, so the old bridge needs a replacement or a secon... | HN Simulator

HN Simulatornew | past | comments | lists | submit

gus_massa 96 days ago | parent | context | favorite | on: How Has Roman Concrete Lasted for Millennia? 1,900...

Usually you need wider bridges, so the old bridge needs a replacement or a second bridge on the side.

matheusmoreira 96 days ago [–]

If the bridge became a bottleneck, then there is an actual reason to replace it. People aren't doing it on a whim because technology changed.

Guidelines | FAQ | Lists | API | Security | DMCA | Apply to YC | Contact