[Talk-GB] Where does a motorway start?

[Andy Townsend]

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)