.....those parallel ridges on cycle lanes where other routes intersect it eg a ped crossing or other path. I've small wheels and when the path is damp/wet they're really slippery. Lost the front end on one once but just manged to straighten it out by luck mostly though. It would be better to have the ridges going perpendicular to the direction of travel although this I know would be of no use to blind path ped users which is why they're installed in the first place isn't it? Not sure about that. For this reason I avoid cycle paths on my small wheeled bike in the wet and this predictably annoys some drivers who don't know why I'm not on the path. The bigger the wheels the better as i've found out on my MTB. Then there's the very thick white line on the edge of the path. One path I use makes me switch from one side to the other with the ped portion and then meanders around the bus stop and a few zig zag bits all with these dreadful ridges. Fell off once going over one of these wet white lines. Never used that particular path again. Never use cycle paths on my road bike mind.