OSM is heavily invested in the “lanes” concept for an individual way, so 
tracing the individual lanes of a road with multiple way lines breaks OSM’s 
routing (as I understand it) There are plugins for JSOM to let you view the 
lanes you make. I personally have no idea how to use them or how to map the 
ways going through an intersection, but I assume there is a way without tracing 
it lane by lane. it is a weird mix of visual, spatial representation and 
logical, tag based representation. 

http://wiki.openstreetmap.org/wiki/Lanes

Ramps, and other linking roads that are actually separated - turn only lanes 
separated by islands, motorway exits and entrance ramps (slip roads?) , and 
other little roads that connect trunk, primary, secondary, and tertiary roads 
to other roads are tagged as “xxxx_link” - so it is already possible to map the 
slip roads for almost any kind of road using the existing highway=xxxx_link 

http://wiki.openstreetmap.org/wiki/Highway_link

javbw


> On Jun 23, 2015, at 5:34 PM, Florian Lohoff <f...@zz.de> wrote:
> 
> 
> Hi,
> 
> I was watching this video on Route Guidance of SOTM US 
> 
> https://www.youtube.com/watch?v=hwglqOV6I9M
> 
> At about Minute 8:10 he talks about multi-lane cross-sections
> and tagging of the short interconnects. I know the Problem with
> the names on them. He says commercial data providers to tag them 
> as beeing parts of the crossing. 
> 
> Do we have tags for this?
> 
> I'd love to improve route guidance by tagging ramps, cross sections etc.
> 
> Flo
> -- 
> Florian Lohoff                                                 f...@zz.de
>     We need to self-defense - GnuPG/PGP enable your email today!
> _______________________________________________
> Tagging mailing list
> Tagging@openstreetmap.org
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