[Tagging] piste:type=nordic but without underlying track

[Eric Sibert]

Hi,

I'm also using piste:type=nordic alone not only in field but also on  
track/road because a lot of things are different between piste and  
road. Physically, the piste is over the road but don't use his  
surface. Road is open in summer, piste in winter. Piste could be  
oneway and not the road...

You can see what I did there : http://osm.org/go/0CC~gQzS

Eric