On 24 August 2017 01:09:29 BST, Greg Troxel <g...@lexort.com> wrote:
>
>My impreession is that in the UK, there were A/B/C/U, and then later M
>were created, and I'm not sure when trunk happened.
>
The term trunk goes back long before OSM, they date back to The Trunk Roads Act 
1936.

On the ground trunk roads are denoted by green signs and are mostly A roads, 
but there are exceptions such as a B road linking the trunk A6 to the M6 near 
Shap. 

Other A roads have white signs. 

HTH Phil (trigpoint) 

-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.

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