[OSM-talk] Motorway junction tagging

[Andy Robinson]

Paul,

Pleased to hear you have taken an interest in OSM.

To my mind your question can be answered in two ways. Firstly for map
rendering we only need to see the junction reference once. Therefore simply
a node adjacent to the junction with a highway=motorway_junction and ref=J6
should do the trick. Additionally for navigational use you might tag the
nodes leaving the motorway (where the motorway connects with the exit slip)
with a similar tag with the ref containing something line ref=J6N_Exit. You
could also do the same for the entry sliproads where they leave the other
designated highway, like ref=J6S_Entry

Hope this helps. Basic details as per the wiki Map_Features.

Cheers

Andy

Andy Robinson
Andy_J_Robinson at blueyonder.co.uk 

>-----Original Message-----
>From: talk-bounces at openstreetmap.org [mailto:talk-
>bounces at openstreetmap.org] On Behalf Of Paul Dixon
>Sent: 17 September 2006 8:49 PM
>To: talk at openstreetmap.org
>Subject: [OSM-talk] Motorway junction tagging
>
>Following the excellent talk OSM gave to HertsLUG last week, I've been
>generating tracklogs of journeys and taking very circuitous routes as a
>result. I've also discovered JOSM is curiously addictive :)
>
>One question which I'm not sure is answered on the wiki is how to
>document motorway junction numbers.What should be tagged as "A1(M)
>Junction 9" - the motorway_link? the roundabout? a node in the middle of
>the motorway? Each has it's pros and cons with regard to renderability
>and navigability, but what's the current consensus?
>
>Paul
>
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