The road paint, I was going 50 and when I slipped I break got down to about 30 and my front wheel locked up. When I first started riding I stopped at a roundabout and front well slipped on the road markings, no damage to me or my bike, just a bit embarrassed, lucky was basically stopped, just picked bike up and rode off Ye it's crazy how slippery it gets didn't think it would be so dramatic, usually it's slightly side but that day must have slipped, 3 times before I fell (not in 1 ride)