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Should the line in a roundabout be split in each intersection with the other highways? or the line in the roundabout should be one subject only?

asked 24 May '14, 01:33

lfttp's gravatar image

accept rate: 0%

It depends. Often roundabouts can be drawn as a single way, but sometimes they need to be split such as where short sections cross bridges over another highway below. All sections will be tagged as roundabout and be the same type of highway and when considered together will form a closed loop. In the split case it is unlikely to be at the junction nodes with the joining highways; usually at other nodes that are part of the roundabout, though you might split at the junction nodes for example when mapping bus routes that only use a section of the roundabout. I can't be certain from this phone but think is a split example.

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answered 24 May '14, 06:26

EdLoach's gravatar image

EdLoach ♦
accept rate: 22%

edited 24 May '14, 06:35

Depending on who you ask, it may be acceptable to add entire roundabouts (and entire areas) into a route relation. For example, JOSM's relation editor properly handles routes containing roundabouts.

(24 May '14, 10:12) Tordanik

I draw roundabouts as a singular circular closed way and the guidance here seems to suggest the same wiki about roundabout

Like this ... alt text

Haven't seen one like this yet but I would consider this incorrect :) alt text

Edit: On further consideration and checking some of the different kinds of roundabouts on the wiki link above, I can see that the more complex roundabouts, would be best mapped by splitting into several sections and be separately named and may be of different class too.

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answered 24 May '14, 02:18

nevw's gravatar image

accept rate: 9%

edited 27 May '14, 16:39

neuhausr's gravatar image


Roundabouts consisting of more than one way are not incorrect.

(26 May '14, 07:47) scai ♦

I'd assumed that it was the mix of different road classes on the roundabout that was "considered incorrect" here.

(26 May '14, 08:40) SomeoneElse ♦

Oh, I see. Different ways are fine, but different road classes are not.

(26 May '14, 16:50) scai ♦

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question asked: 24 May '14, 01:33

question was seen: 5,836 times

last updated: 27 May '14, 16:39

NOTICE: is no longer in use from 1st March 2024. Please use the OpenStreetMap Community Forum