Do you mean empty cycle lanes?
During one part of my commute I have about 1.5 miles of cycle lane and I've never seen any other cyclist use it as I go past them.
I've even shouted several times 'There's a cycle lane here'.
Given the state of some of the cycle lanes around here I'm not surprised.
I use them where I can but a lot of the time they are poorly surfaced, broken up, potholed and if they are at the side of the main carriageway they are often full of detritus such as broken glass and litter.