last night i was riding in the crap weather on the 401, dark, rain, hail, heavy traffic, and boom, passed a huge chunk of debris, like half a huge recycling bin or something sitting in the left part of the slow lane...didn't see it til the last second with everything going on, missed hitting it, but only because it wasn't in the track i was riding, it was just to the left...the car in front of me clipped it and spun it around a little...i would say a rock would definitely not be something i would like to run into...