Harry Wood
Yeah these connecting bits were white unclassified roads for a little while, but should be either secondary or trunk to make the map look naturally connected up. On the ground (photo: https://www.flickr.com/photos/harrywood/33231014382 ) there's nothing to indicate whether these connecting bits are part of Archway rd or part of Highgate hill. Up until recently they formed a big square roundabout called "Archway Junction"..  Anyway. It's fixed to be reasonably logical now I think.