[baddox]

So where are all the automatic bridge-building machines? Isn’t our bridge infrastructure famously poor?

[extradesgo]

Right. The automation nuts are wildly disconnected with reality.

[flukus]

Of course there's no single bridge building machine, but most of the work in bridge building is done by a collection of machines, usually with human specialists operating them. It's not the 1920's and most digging is done by an excavator instead of a human with a shovel, most cement is delivered by a truck humans mixing it onsite. As much as possible will also be prefab.