Maybe I'm missing something but surely it depends not only on the radius of curvature of the track but also the width of the tunnel. It has been bugging me that ways have no width in OSM. But I suppose the alternative would be very hard to manage.

Secondly, even if you don't trust the path marked when inside the tunnel .. you could at least work out a minimum radius of curvature based on the heading of the tracks as they join each end of the tunnel.

Russell


On 16/10/12 18:40, Nick Hocking wrote:
Actually, I've just had a go with a 50 metre "stick insect" in JOSM and it is REALLY touch and go (or is that touch and stay).
Nick


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