I noticed that several roundabouts that consist of multiple lanes are not modelled as such in OpenStreetMap. In practise, depending on the lane on which you enter the roundabout, you have access to different exits. In OpenStreetMap these roundabouts are modelled as single lanes. Is there a reason for this? It seems it would be useful to model these lanes for navigation purposes.

Examples: Prins Bernhardplein, Zaandam, The Netherlands https://www.openstreetmap.org/edit#map=18/52.45374/4.82275

Houtribweg (N307), Lelystad, The Netherlands https://www.openstreetmap.org/edit#map=19/52.54925/5.51436

Laan der Continenten/Donaulaan, Purmerend, The Netherlands https://www.openstreetmap.org/edit#map=19/52.50064/4.93888

asked 03 Jan, 12:33

defluyter's gravatar image

defluyter
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edited 03 Jan, 12:34


The multi-lane roundabouts from your question simply haven't been tagged as such. In other areas multi-lane roundabouts do exist in OSM. You can find multi-lane roundabouts via Overpass API, for example way 227772876 and way 131245452.

If you know the number of lanes then simply add it with the lanes key. The turn:lanes key is also very helpful for navigation systems.

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answered 03 Jan, 13:01

scai's gravatar image

scai ♦
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edited 03 Jan, 13:04

AFAIK there is no technical reason for the roundabout lanes not to be mapped as such (aka the existing lane tagging should work too). So the conclusion is simply: nobody has bothered to do so up to now.

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answered 03 Jan, 13:04

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SimonPoole ♦
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question asked: 03 Jan, 12:33

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last updated: 03 Jan, 13:04

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