I was doing a quick round of 60 km and was on my way back home when i suddenly woke up in an ambulance. The story was that i hit a pole standing in the middle of the cyclists road to prevent cars from entering. Apparently i smashed into it with my right knee. Very odd was that my bike was not damaged, and i hardly had any scratches besides my knee. I am riding with 4 seasons tyres since i fell in the past when it was wet. Works for me eventhought they are a bit heavier.