[Colress stays quiet as he considers Sigrun's viewpoint here.]

While I don't outright disagree with you that there are merits to having humans direct traffic, I wouldn't say that the general population in my world shares the same sentiment regarding machine versus human-operated approaches to directing traffic.

If a machine can do it just as well, it is much more efficient than placing a human at every single intersection. It is not as if humans are not involved in the process though- as I said, they step in when needed, and they do keep the traffic lights in working condition with regular maintenance.