the two hazards I have to watch out for here in the midwest are painted lines on the roadway and manhole covers. Both are rather innocent on their own, but when combined with even a couple of drops of water they become slip and slides. The last time I fell, I was stopped at an intersection waiting to turn left with several cars behind me. The green arrow came on indicating it was my turn to take my left, but as soon as I stood up in the pedals the front wheel shot out from under me and I did a somersault with my feet still clipped in. There was a wide white line on the road indicating the presence of a crosswalk that I didn't see. I felt bad because there must have been 40 cars sitting around waiting for me to clean my crap up and get out of the intersection, but not one driver offered to help or even rolled down a window to check and see if I was okay.