[OSM-talk-ie] Multi-part roundabouts

[Colm Moore]

Hi,

Normally a roundabout is drawn with a single way. However, when relations for say, bus routes or boundaries are added, the way can be split into several parts, as the bus usually will not use the whole roundabout. As there are several parts, using the 'round' tool to make sure the roundabout is circular (if it actually is circular on the ground) is not possible. My previous solution was to add a circle (a 'construction line') to the roundabout nodes, use the round tool and add the following tags:

area=yes
note=Circle for maintaining shape of multi-part roundabout

As there is a certain amount of effort in drawing the circle and making sure it includes all nodes, I have saved the construction lines so that if the roundabout has additional ways added (e.g. for the triangular traffic islands that are common on most roundabouts) or is inadvertently twisted out of shape, the round tool can be used again. Example here: https://www.openstreetmap.org/way/448599590 - this is currently very slightly off circular.

An issue arises in that iD thinks that the above tagging is insufficient and now refuses to allow any changes to be saved. JOSM still allows insufficiently tagged objects to be saved. 

Would anyone have a better solution? There are currently ~102 roundabouts tagged in this way, although there may be others that are still irregularly shaped. As in the recent discussion about attaching landuse to roads, I am not sure that adding a landuse or similar tagging would be appropriate.

Thank you

Colm

PS It is probably best that boundaries go straight through the centre of roundabouts and not follow the roadway - most boundaries were laid out before roundabouts existed.


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