Hardly any cycle lanes around here, but the ones I am aware of - and refuse to use - are not fit for purpose. One is nothing more than a potholed, gravel-strewn pavement. Any cyclist will tell you that cycling on gravel is like cycling on ice! The other is narrow, disappears at every side road and is frequently parked on by cars, forcing anyone trying to use it to have to move out onto the main carriageway every twenty yards, which is much more dangerous than being on the road all the way.
Road planners haven't a clue, and neither do a lot of non-cyclists. There is a roadbridge nearby that spans both railway and canal. To save money, it was built with just one carriageway, and traffic lights to control it. Problem is, cyclists, even the racers, can't get across the whole bridge before the lights change again, so regularly get abuse, even threats from car drivers who assume that they are jumping the lights. (I should add that there is plenty of room to pass, so cars are not inconvenienced, but they still feel justified in hurling abuse at perfectly law abiding cyclists!)