When I'm virtuous, I ride the bus to work. It's free (my company provides the pass), good for the environment and when I manage to make the express, takes almost no longer than the drive. Best of all, it's almost two hours a day of reading time!
Lucky for me, reading on the bus doesn't usually cause me any upset. I have to admit though, not every book is a "bus book." If the book is physically too big, or if the writing is too dense, requires careful detail reading (I skim more than I'd like to admit), or worst of all, doesn't have the maximum attention-holding story, it will have a hard time competing against the distractions of a bus environment. Often I'll read for 10 or 15 minutes, zone out for awhile, fidget uncomfortably, glare at the loud cell-phone-talkers, speculate on why people wear so damn much perfume or cologne, check to see if Mt. Rainier is visible, and then when I'm bored again, open up the book again.
Some books though, suck me in so thoroughly that I don't look up from the pages unless my seatmate gives me the hard nudge, or best of all, when I notice the change in the road when we leave the interstate and hit the surface roads.
These are my favorite ones. They pass the bus test.
How about you? Do you read on public transportation? What are your favorite bus books?