Are they wide enough to provide segregated provision throughout? If you would like to convince me of this, please show some plans.
As well as quoting "It's a question of setting priorities and then letting the experts come up with the detailed plans, not producing our own detailed plans first, which will be out-of-date before they're ever built" maybe try comprehending it? I'm not a highways designer either and even if I were, would I have time to work for free just to best you in an argument?
Pick whatever street you like. It may take some tough choices. It may involve redirecting other traffic or worse. Unless it's a narrow foot-only alley, there is space. The question is more whether space for cycling (whatever form it takes - not only kerb-protected lanes) is important enough that the politicians will reallocate it to us. As the old habits fail to address congestion, obesity, pollution and so on, it becomes more likely.