In the UK I have never seen a public bus system that allows you to take a (non-folding) bike on the bus. (There are long distance coaches that do allow bikes, however I am asking about local busses.)
I know that some other places have buses with bike racks.
- Where are the buses that have bike racks?
- How common is it for buses to have bike racks?
On some UK buses you may be able to put a single bike in the wheelchair space, ask the driver nicely.
In the US there seems to be lots of buses with bike racks on the front or back. Mostly these racks can take no more than two bikes. I was not expecting the land of the car too have better provision then the UK!
No where can you depend on being able to put your bike on a bus (due to lack of space).