So there I was on my way to the climbing wall, when I noticed lots of people with hi-vis jackets with "Marshall" on. Thought it must have been a cycle route, a road running race or something similar. Turns out it was people directing through traffic in the other directions onto a newly opened through road, to ease congestion on the Hornsey Park Road round the back of the shopping centre at Wood Green.

Of course, I had to investigate it on the way back. Turns out that I was beaten to mapping it by someone else, but I did upgrade it from highway=unclassified to highway=tertiary, since on my logic:

It has a central lane dividing markings, allowing for decent two-way traffic.
It is advertised as a through route.

It's actually quite a good through route, though it starts of pretty windy through an industrial estate on the southern end. I'll definitely be using it again if I'm driving.

I guess I could go and ask Haringey council if it really is a C-road, but they might not know. In writing this entry, I've just realised that there appears to be different spellings of the borough. Harringay, or Haringey? Which is it? The council don't seem to know. There's conflicting spelling on their own web site. Transport for London call it Harringay,