[Tagging] exit_to on motorway_junction

Colin Smale colin.smale at xs4all.nl
Sun Nov 18 20:26:51 GMT 2012

Phil, there's a difference between routing calculation (which neither 
knows nor cares about road names, numbers, signposts etc) and how the 
result of the calculation is presented to the user. Then you need to 
relate the nodes/edges in the routing graph back to the real world. The 
value in this tag (as well as name, destination etc) is that the 
navigation software can give instructions based on recognisable 
landmarks instead of referring to way IDs. This distinguishes between 
pure "routing" and "useful navigation".


On 18/11/2012 21:12, Philip Barnes wrote:
> On Sun, 2012-11-18 at 20:20 +0100, malenki wrote:
>> What is the use of tagging some examples where one road connects to
>> when there is a system-inherent focus on finding such connections
>> automagically (this one is called "Routing")?
>> I'd like to have examples, please
> I found this one by accident when I was looking at motorway junctions
> after reading this thread.
> http://www.openstreetmap.org/?lat=52.65853&lon=-2.29423&zoom=15
> Eastbound	Wolverhampton (W) A41
> Westbound	Whitchurch A41;Weston
> They are just copied from the signposts. I see no value in this tag,
> after all as you say its called routing.
> Phil
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