You have to pay workers more at night which will increase costs in areas that currently use day workers. That is just what I can think of offhand. Likely there

You have to pay workers more at night which will increase costs in areas that currently use day workers. That is just what I can think of offhand. Likely there are no fullproof solutions to this problem, but rather OK solutions that will work in some cases and not in others. Then again, the future probably has all road work done by robots too so this will be less and less of an issue.