How to correctly map a rondabout where there is separate lane for first exit?

  1. OSM roundabout 1, street view
  2. OSM roundabout 2, street view

I'm quite confused because separate lane through the roundabout (In real world) suggest to draw such separate lane in OSM. But OSM guidelines says every route has to be connected to roundabout (as separate node) itself.

asked 04 Jul '18, 10:10

Travnick's gravatar image

Travnick
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edited 04 Jul '18, 13:15

SimonPoole's gravatar image

SimonPoole ♦
38.7k13287614


We currently likely don't have a way of accurately modelling this situation in OSM.

I suspect the best way to get a roughly working solution is to map the dual lane sections of both the roundabout and the streets leading up to them with two lanes and make the right-hand lane with "right"

So in the first example that would be

turn:lanes=none|right on the road leading up to the roundabout (ignoring the other side of the road for now)

turn:lanes=none;right|right on the section of the roundabout it merges in to.

YMMV

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answered 04 Jul '18, 13:27

SimonPoole's gravatar image

SimonPoole ♦
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I've done similar in the past. OSM way: https://www.openstreetmap.org/way/44068137 GSV: https://goo.gl/maps/FEEMjcqttiA2 (note this is UK, so first exit is left rather than right). Edit: I have looked closer at your GSV examples and realise there is a slight difference in that there is a solid line which I'm assuming vehicles can't cross, but would still go with Simon's turn:lanes suggestion for an appropriate set of values.

(04 Jul '18, 16:16) EdLoach ♦

Not perfect, but good enough to render accurately and for navigation systems to get the lane guidance right.

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answered 06 Jul '18, 00:13

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Paul Johnson
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accept rate: 10%

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question asked: 04 Jul '18, 10:10

question was seen: 529 times

last updated: 06 Jul '18, 00:13

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