[Talk-GB] Where does a motorway start?

[Paul Berry]

Casually, they start/end at the diverge/merge of the motorway slip roads
with the public highway. However, more precisely, it's where the chopsticks
(start/end of motorway) signs are. It depends on the location but these are
*almost always* just beyond/before any footpath (eg around the perimeter of
a roundabout interchange) which crosses the very start/end of a sliproad.
The crossing can't be after the chopsticks on an entry slip, or before the
chopsticks on an exit slip, as pedestrians (among others) are strictly
prohibited from a road under motorway regulations. Extreme example here in
Leeds City Centre: https://www.openstreetmap.org/node/1675168103

Regards,
/Paul/

On Wed, 3 Aug 2022, 10:19 Andy Townsend, <ajt1047 at gmail.com> wrote:

> Hello,
>
> The DWG has recently had an email from someone asking about some recent
> motorway edits.  These have been in various places, so I'll pick an
> example local to me, where the A64 joins the A1(M):
> https://nrenner.github.io/achavi/?changeset=123673170 .
>
> The edit moved the start of the motorway from where the roads diverge:
>
>
> https://www.mapillary.com/app/?focus=photo&pKey=2478290038984023&lat=53.856169399972&lng=-1.3365381&z=17&x=0.48881009070232434&y=0.6403049169362514&zoom=3
>
> to just after the “chopsticks” sign visible in front of the lamppost at
> the right of the carriageway in edit mode at
> https://www.openstreetmap.org/#map=18/53.85550/-1.33895 :
>
>
> https://www.mapillary.com/app/?focus=photo&pKey=493444768591097&lat=53.855654360067&lng=-1.3384409007607&z=17
>
> 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.
>
> Best Regards,
>
> Andy (from OSM's Data Working Group)
>
>
>
>
> _______________________________________________
> Talk-GB mailing list
> Talk-GB at openstreetmap.org
> https://lists.openstreetmap.org/listinfo/talk-gb
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/talk-gb/attachments/20220803/6c992d46/attachment.htm>