I am new to commuting and the small county I live in doesn't have city busses. Last week on the way home from work I had timed a light perfectly and as a large garbage truck took off from the light I got on his right rear corner and could instantly feel the draft. What I failed to think about beforehand was what it would smell like. I thought I was going to lose my lunch right there on my bike. I might try it again sometime with another type vehicle.