Here in Dublin we have a serious problem with off-road on-pavement cycle lanes set up. There's legislation in place that cyclists must use them if they're there, fortunately they're illegally marked so I know I can get out of a court case on the technicality.

These on pavement cycle lanes are shared with pedestrians who ignore them, cross front of crowded bus shelters (great when a bus is just about to arrive), and the best bit - cross side roads frequently (every 40-50 yards) where the cyclist must yield (sign posted) to traffic pulling out.

I ignore them, cycle lane == dangerous in my book.