Erect temporary barriers and do the work outside of peak traffic times..Agreed, they did the same here when they dug out an old small chamber and built a larger (standard size) chamber.
https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9...
This took up the whole pavement so they added a barrier on the road so people could walk down.
So that could work, but on a main road that would still possibly require lights.
Paul



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