[Talk-GB] Where does a motorway start?

[Tony Shield]

There is an issue with the OS maps your refer to  - the April 2022 
version is downright wrong. 
https://os.openstreetmap.org/#zoom=16&lat=53.85451&lon=-1.33906 shows 
the exit onto the roundabout as Motorway, it is not it is the A560 exit 
ramp and starts before the motorway. Similarly the northbound on-ramp is 
non-motorway.  The 2016 version shows it correctly.

I hear what is said about stylesheets - and if they are wrongly coded 
the map is wrong - not unclear.

Google streetview 
https://www.google.co.uk/maps/@53.4022745,-2.2679173,3a,75y,190.8h,103.87t/data=!3m6!1e1!3m4!1s4bdfjgHeV8AmFLXJ8jPH3g!2e0!7i16384!8i8192

and Mapillary 
https://www.mapillary.com/app/?lat=53.402407930641&lng=-2.267712946307&z=17&pKey=464656738193601&focus=photo

show the reality and is correctly mapped in OSM.

Where does he motorway-link start for ramps - at the start of the 
imaginary gore (the thick white lines or the chevrons - whichever is 
first and which is the last place of escape for prohibited traffic

Tony

On 03/08/2022 10:44, Mark Goodge wrote:
>
>
> 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
>
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