You can make it longer, adding more passenger space.
A bus that long wouldn’t be able to make many turns except at the largest of intersections. Probably safer too since there’s less dependence on the driver being good. They just need to know when to speed up and hit the brakes.
This makes more sense to me. I don’t see any advantage to laying a physical rail if you are just building a bus.
The only advantage I can think of is more easily lining it up with level boarding platforms.
You can make it longer, adding more passenger space.
A bus that long wouldn’t be able to make many turns except at the largest of intersections. Probably safer too since there’s less dependence on the driver being good. They just need to know when to speed up and hit the brakes.