In alt.home.repair, on Tue, 15 Jun 2021 13:32:27 -0700 (PDT), Dean
Hoffman wrote:

Now Fedex is testing Nuro for package delivery
https://www.axios.com/fedex-nuros-robot-cars-package-delivery-dd3cb415-e513-4a13-8a07-3003807d65b8.html

There must be some silly situations where humans just wave another through and these things will just sit there. Imagine four of them pulling up to a four way stop simultaneously and just sit there, for example.

According to my History Fun Book, from when I was 10, there was a state
where the law was, verbatim from the FunBook, "When two cars [or maybe
locomotives] come to an intersection, both must stop and neither can
proceed until the other has passed."

I don't remember if it said what state that was.