I used bus and car interchangeably there as per the link the top speed of the fastest rapid transit was 80 miles per hour. Even a school bus has a 70mph top spe

I used bus and car interchangeably there as per the link the top speed of the fastest rapid transit was 80 miles per hour. Even a school bus has a 70mph top speed. Of course, I'm aware that things are much faster (literally) outside the US, but the OP was referencing the US.