Advance stop lines (asl's/ bike boxes) A WARNING!

[Grahamm]

Segregated cycle lanes, in my experience, are there to keep cyclists off the road rather than to protect them.

I entirely agree with you.

There are some like that in Portsmouth and, like that one, you get pedestrians (or other obstructions) in the cycle lane and if you're cycling, every time you get to a road, you have to waste energy slowing or even stopping to let traffic cross, then expend more energy getting moving again which means you are not cycling in the most efficient manner (which is to lose as little momentum as possible).

As such, I simply do not bother using those cycle lanes.