but I had a big surprise reading the "on the ground" rules. Who makes up this stuff?
Not really that daft, if you imagine on a taxiway you are essentially taxiing on the RH side, so to overtake OR pass opposite you go onto the "dead" side of the taxiway. In practice most people taxi in the middle and there is very little overtaking, but if, for example, someone had a problem and needed to stop they should pull to the right, thus allowing both opposite direction and following traffic to pass correctly.
