The middle of the carriageway is often the safest position for a cyclist to be in on a minor or quiet road, or where the road bends sharply. But why do so many cyclists insist on keeping in to the kerb?
Whether it's fellow members of CTC staff or random members of the public, I am often puzzled by the number of cyclists who insist on riding in to the edge of the road, whatever the traffic conditions.
Bikeability/National Standard cycle training encourages riders to take up 'primary position' wherever possible - that is usually in the centre of the carriageway in the direction of travel. John Franklin devotes several pages to it in his seminal work 'Cyclecraft'.