Hello all.
Most rural roads near me are yellow on OS landranger 1:50,000. Middle-zoom on OS opendata website shows much fewer as yellow.
Any advice on what resource to use to classify primary streets?
Thanks.
I tend to use OS Opendata as a guide, but I think they are all just “guides” as such - I don’t think there is any “official” designation of primary street.
You said “near you” - in that case I would suggest using your own opinion and erring on the side of fewer rather than more primary streets.
I get the impression that it’s a more significant choice where there are a lot of roads around and a potentially large number of route choices. In those cases, “primary street” indicates the “normal” route through an area. I think Waze will prefer the primary street if there are no traffic problems and generally avoid routing you through all the back-streets.
Here in London, I’m surprised I have never seen cases where somebody has “promoted” their preferred route to primary street to nudge Waze into using it - or demoted a primary street because they don’t like traffic where they live. I have a primary street near me with vicious road humps on it! :shock: I’m often tempted to demote it, but then I’m sure Waze would just route along the side streets alongside it. And the road humps are there for a reason. 
Thanks Iain, that’s what I’ll do then. My local knowledge is limited in radius, but I’ll lay out the skeleton routes and the local wazers can adapt them if needed.