[Talk-GB] Secondary, tertiary and unclassified

[Tom Hughes]

On 04/11/15 12:54, James Tait wrote:

> If I were to follow the guidelines in that changeset, Uttoxeter Road
> (B5020) would be a tertiary road, and Etwall Road would be
> unclassified.  I don't know which roads are maintained by the Highways
> Agency, but my gut says that the A38 would be a trunk road, and the A516
> might be primary.

Stop. Go no further. Do not pass go, do not collect 200 pounds.

highway=trunk is NOT the same as a UK Trunk road

The rule in the UK is simple:

highway=trunk is the Primary Route Network (green signed A roads)
highway=primary is other A roads (white signs)
highway=secondary is all B roads

That has been the rule for the best part of ten years, gives good 
results, and is generally easily observable on the ground.

Tertiary is, as we've been discussing, more complicated. It is generally 
used for non-B roads that are none the less significant in some way.

If we did try and map it to sub-B classifications then we would probably 
have to do it on a per-authority basis as each authority has it's own 
classification scheme below B.

Tom

-- 
Tom Hughes (tom at compton.nu)
http://compton.nu/