I'm retired from the fire department, but one day a couple of years ago I stopped in at one of the stations on my bike to BS with a couple of the guys. This happened to be a very hot and dry summer, and a lot of the blacktop roads had developed some cracks from expansion of the pavement. Anyway one of our medics told me about a run he had made a couple of days previously where a guy on bike had his front wheel drop into one of the cracks in the pavement and did a face plant.
I also crashed once at an intersection when, looking over my shoulder to clear traffic as I made the turn, my front wheel encountered a pavement joint - more a case of the two sections of concrete not being at the same elevation - and tripped me up. All I got was a badly road-rashed knee and shin, though.
Gotta keep a close eye on the pavement with these skinny-tired road bikes!