It might be hard to find people here who know the answer to your question, so I suggest you try it. Maybe on a Sunday, when you're not on the way to work, you can ride over to the bus stop and test the rack. Tell the drive what you're up to, and it will only take half a minute.

^ ^ ^ What he said. I take my bike on the bus regularly, and it depends on the rack system your bus company uses. Also, if it doesn't fit and you're very nice, your driver might, maybe let you take the bike inside the bus.