I mean, in highly populated/dense areas sure, but public transportation doesn't really work in rural America.
The 2020 census proposes using "385 housing units per square mile as the primary criterion for determining whether a census block qualifies for inclusion in an urban area". Previously it was 1000 people per square mile (or equivalent to the above with 2.6 persons per household).
https://www.federalregister.gov/documents/2021/02/19/2021-03...
So it isn't the case that rural public transportation simply can't work.