It's been a while since I drove up here, but I don't think that what's mapped (4 parallel roads) matches what's actually there (the imagery suggests 1 road with no physical divider, with the carriageways separated, and that fits with my recollection).

The Bing imagery suggests that this tertary road here doesn't actually exist - it shows a turn lane on the A158 only.

Does this tertiary road really exist? The Bing imagery (and my memory!) suggests not, and that there's actually just a turn lane on the A158 instead.

This whole area needs a proper survey (Bing is out of date - there's a service road now running through where the Travelodge was).