Cycle lanes are narrower than general-purpose lanes because they are largely put there to serve the interests of drivers.
A small car, I think, generally. The rationale, I suspect, is that that's a reasonably safe margin, and easier to get right than "well, you need to allow a bit of wobble room, and a bit of room for your error, and a bit more room if you're going quickly, and..."
Taxis overtake vehicles with tiny margins; they also do this to cyclists, which is dangerous and frightening for the cyclist.
Cars are generally faster and always harder and heaver than cyclists. If a cyclist overtakes and gets it wrong, they're the one who is going to end up hurt. Furthermore, they have no slipstream impact on the car, nor are they going to intimidate the car by overtaking closely.
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A small car, I think, generally. The rationale, I suspect, is that that's a reasonably safe margin, and easier to get right than "well, you need to allow a bit of wobble room, and a bit of room for your error, and a bit more room if you're going quickly, and..."
Taxis overtake vehicles with tiny margins; they also do this to cyclists, which is dangerous and frightening for the cyclist.
Cars are generally faster and always harder and heaver than cyclists. If a cyclist overtakes and gets it wrong, they're the one who is going to end up hurt. Furthermore, they have no slipstream impact on the car, nor are they going to intimidate the car by overtaking closely.