Hi emsr2d2,
do you mean public buses include tourist buses?
Generally, I mean what I say. If for some reason I had meant "tourist buses" (whatever they are), I would have said "tourist buses".
In the UK, buses which travel relatively short distances on a fixed timetable and are available for members of the public to get on and off wherever they choose (and pay for the privilege) are just called "buses". They are part of the public transport network.
The type of public transport which travels longer distances is called a "coach". Usually, you have to book a ticket in advance for those.
It is possible to hire both buses and coaches as a private individual but when you do that, you're not using public transport.
We don't have anything called "tourist buses". Tourists can get on and off public buses, just like everyone else. We're nice like that.