In the NHTSA pdf? They're roughly in the middle of the lane.

In the article, specifically the picture they appear in https://www.portsmouthctc.org.uk/wp-content/uploads/2013/12/...

The argument "it's the cyclist fault she got killed for not wearing bright colours" is practically the same as "it's the woman's fault she got raped for wearing a short skirt"

Maybe cyclists should be forced to wear high vis clothes so car drivers can drive around without awareness. Maybe schoolkids in the UK should wear bullet proof vests so gun owners don't accidentally shoot them. Maybe women should be forced to wear burkas so men don't get tempted. These arguments are very similar logic.

However if cyclists are to take some responsibility for their safety on the road, not riding at the edge of a lane is the first thing to do, not wearing a burka or a flak jacket.

It looks to me like they're in a perfectly sensible position - just outside the door zone as they approach some parallel-parked cars. Am I missing something?

They are in the second lane, then they are too close to the left most lane. A vehicle (especially a large vehicle) passing up the inside could be very close. If the yellow rider were to move slightly to the left, the blue one would probably swerve towards the left lane, but there's no where to go.

They are also encouraging in-lane overtaking, which might just about work for a motorbike or another bike, but anything wider would be a problem

The yellow topped one is probably OK in lane position if the other cyclists weren't there (but why not another metre to the right). However he's very close to the blue one. The blue and stripy ones run the risk of being hemmed in by traffic from the rear

Thanks for the reply! Studying the photo more, I see that you are right about them being in the left of the second traffic lane - it's not parked cars like I thought previously.

They are riding at the left side of the usable road.

Note the park cars ahead (and probably also behind) make the lane to their left unusable.