[Talk-GB] Where does a motorway start?

[Mark Goodge]

On 03/08/2022 09:18, Andy Townsend wrote:
> 
> I suspect that this is more a question of style than anything else - no 
> router is going to send non-motorway traffic down a oneway section of 
> trunk link which only exits to a motorway link. Personally, I'd say that 
> the motorway starts where the roads diverge, but I didn't feel strongly 
> enough to comment about it when I saw another of these changes a few 
> days ago.  I said to the DWG's correspondent that I'd ask here, so here 
> this message is.

The designation of a road at any given point is a matter of fact, not 
observation. Although we don't have access to the canonical source, the 
NSG, the status of a road is included in OS OpenRoads and OS OpenMap 
Local, both of which are acceptable sources for OSM.

In this particular case, OpenMap Local starts the motorway at the junction:

https://os.openstreetmap.org/#zoom=16&lat=53.85451&lon=-1.33906

The overlap on the latest version (2022) appears to be a stylesheet 
issue, it's actually clearer if you use one of the archived versions 
(eg, 2016) which use a different stylesheet.

Mark