What a senseless waste of power! Maybe we can use the spare humans to perform protein folding calculations while waiting for the bridge to be set.

One reason road construction crews have so many people standing around is that the work is very hard. You have one guy digging in a hole in the summer sun for, say, 20 minutes. Then they pull him out and he downs some Gatorade and the next guy goes in. You really can't push much harder than that without pushing your luck with heat stroke.