Not all of it, but a lot of it is. Highways England in particular need to get it through their thick skulls that 0.8m isn't really even wide enough for a single bike (the official width of a cyclist's envelope is 1m, plus another 0.5m if going slowly).
But the infrastructure being built now won't need to cope with everyone cycling. At least, not the ones alongside roads. It should only need to get us to the point where there's a critical mass and cycling can reclaim the carriageway, either through reallocation of space (bollarding off left lanes) or sheer weight of numbers. This is yet another reason why it's important that anyone who wants to cycle on carriageways still can.
Quite. Roads, on the other hand, are already wide enough, and already there. I find it a little bit curious to suggest that the way to 'reclaim the [existing] carriageway' is to cycle somewhere else.
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