one section of cycle lane i can think of runbs all over the place.
starts on the left of the road – where you'd expect it to be, then it dives on the pavement and does an immediate hard right, to cross the traffic, on to the other pavement, then down the hill, onto the pavement (not shared use as far as i can make out!!) then onto a pelican crossing, but not onto the pavement but the road! anyone following from then on even i can't follow it and i've ridden it 100 times. it darts between the road, the parrallel service road and the pavemnt (on the other side of the road. sometimes it is clear-ish some times you just see a bike painted where you should be – invariably too late to get there.
I don't bother! much to the frustration of car drivers!