[Talk-GB] OSM Road Classification - Trunk/Primary

[Michael Booth]

The situation in Scotland came about after comparing OSM's motorway and 
trunk network to Transport Scotland's official list of trunk roads. 
https://www.transport.gov.scot/media/48673/official-list-of-trunk-roads-3-november-2020.pdf

There were some mismatches and it was discovered that a few A roads had 
been tagged as trunk in OSM due to green signs - however there were also 
(usually newer) white signs present on those roads (e.g. the A697). 
Given the discrepancies, it made sense to set these roads as 
highway=primary in OSM, basically deferring to the Transport Scotland 
list to avoid confusion.

On 14/09/2021 17:50, Barry McGuire wrote:
>
> The Scottish OSM maps already have their strategic routes as trunk, 
> with all other A roads as primary, which more closely follows OSM 
> terminology.
>
> England-Scotland border (West to East) - 2 changes at the border (A7 
> and A68)
> * M6 Motorway
> * A7 primary route (Scotland strategic, England non-strategic)
> * A68 primary route (Scotland strategic, England non-strategic)
> * A697 primary route (Scotland non-strategic, England non-strategic)
> * A1 primary route (Scotland strategic, England strategic)
>
> Changes of designation at borders are not unusual, so I'm not 
> concerned about that.
>
> The only real downsides to this proposal are the work involved (which 
> shouldn't really take too long) and the loss of information about 
> which roads are designed as primary - which is a bit of a false 
> distinction in any case as primary routes do not indicate the actual 
> standard or importance of the road, just that they link two 'primary 
> locations'. Note that 'primary' locations do not mean they they're 
> actually important locations, just that they're useful for navigation 
> purposes (e.g. Scotch Corner as a junction, and Stevenage for itself 
> and the towns around it). The use of those locations for navigation 
> purposes made sense in the 60s but with satnavs etc the standard and 
> relative importance of the road should take priority on maps.
>
> Thanks,
> Barry
>
>
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