If (a), what's the rationale? Why a car? Why not a bus? And are we talking about a Smart or a Hummer?
Furthermore, if (a), why are cycle lanes narrower than general-purpose lanes?
My own interpretation is to leave a bike as much clearance as I'd give another vehicle, plus a margin for bike wobble, plus a margin for slipstream, plus a margin for extra vulnerability. So more than (b), but less than (a). It's worth noting that I've passed a driving test without demerit for this interpretation.
It's also worth noting that cyclists routinely give themselves far smaller separations from motor vehicles than they insist motor vehicles ought to give them.
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Furthermore, if (a), why are cycle lanes narrower than general-purpose lanes?
My own interpretation is to leave a bike as much clearance as I'd give another vehicle, plus a margin for bike wobble, plus a margin for slipstream, plus a margin for extra vulnerability. So more than (b), but less than (a). It's worth noting that I've passed a driving test without demerit for this interpretation.
It's also worth noting that cyclists routinely give themselves far smaller separations from motor vehicles than they insist motor vehicles ought to give them.