This is an insidious piece of bollocks which, on the face of it is simply pointless, but is actually quite dangerous.

What this says is that whilst going round a corner, bikes should be in the gutter so as to leave space for cars. Unfortunately this is exactly what should not happen.

Turns - even those that don’t cross other lanes - are hazards, and people on bikes need space. There may be additional unseen hazards (puddles, glass, drain covers, people about to step off the pavement); either rider or driver may misjudge their speed or the tightness of the turn and suddenly require a little extra space; on some corners a gutter-hugging position can make a rider less visible… these things and more mean that when turning (whether left or right) it is totally inappropriate for any vehicle to be passing a cyclist. For the infrastructure to imply the opposite is to send a message to all road users that is deeply harmful to the safety of the more vulnerable.