Ok - I don't agree than only non cyclists can decide cycle lane policy - evidence is apparent in all the manifestly unsuitable lanes we see (I am admittedly assuming non-cyclsts designed them). A non cyclist (to me at least , self-evidently) won't have a clue
On "objectivity" I fail to be see that conflicting goals and priorities such as cyclists' safety (and convenience) versus motorists' convenience, versus small children-cyclist convenience can be objectively decided by some scientific measure. The weight given to prioritising these aims is inherently a subjective or political decision
If you're saying something else then you need to elaborate - preferably not by a wikipedia entry on logical positivisim or whatever
Really the link is quite simple, it's not positivism.
There are broadly two approaches one can take to decision making (this is better and more simply described in wiki); objective and subjective. Without even considering approaches, most people immediately leap to the subjective (I think this because of my personal experience and it stands to reason that X is the answer). You put two or more of these people together and they will never agree on the solution. One on their own and you'll have an answer that is unlikely to solve the actual problem, rather than the individuals perceived problem (E.g. Cars, lack of helmets, blah blah).
An objective approach is to step back and analyse the fundamental problem, line up potential solutions by calling on many sources and analyse them with one or many people with as little vested interest in the outcome as possible.
Once the hypothetical solution options are clear, add other known information, be they facts or estimates with clarity on their source and reliability.
You then have a decision basis from objective analysis, and the problem space and solution space are not obfuscated by opinion.
This then frames the decision making process and makes it hard for emotional decisions to win the day, and if they do, it is at least clear that the objective analysis is being rejected.
This is too much like work for a Saturday so I'm off to maim foxes or something now. I hope I was clear enough to help.