[Tagging] Dispute on highway=mini_roundabout

Andrew Chadwick (lists) a.t.chadwick+lists at gmail.com
Thu May 10 19:30:28 BST 2012

On 10/05/12 18:31, Josh Doe wrote:
> For those interested, you can download all current nodes
> as a zipped OSM file
> (http://joshd.dev.openstreetmap.org/all_mini_roundabouts_20120510.zip),

A *very* quick look at that against Bing imagery in JOSM reveals a
pretty broad selection of things around the world that get classified as

  * Yer classic blob of paint in the middle of the road. This might the
predominant UK usage, and it's common here, but I'm guesstimating it's
more like 50/50 even in the UK because (and this came as a proper
surprise to me) it's also used for:

  * Small roundabouts/traffic circles with defined centres. Sometimes
with quite large planted trees.

  * Big roundabouts/traffic circles, but fairly rarely; perhaps
predominating in non-English-speaking countries, or countries which have
no concept of size distinctions between their traffic circles?

  * Unmarked passing places, where cars can overtake each other on
narrow roads.

  * Turning circles at the ends of residential roads, with or without

  * AFAICT, just random intersections without anything specific.

I wonder how it would be possible to get a more systematic analysis of
this data extract. Perhaps a small app which grabs relevant Bing tiles
for nodes at random and asks the user to classify as yes/no/can't tell...?

(But in short the db data sucks and so does the wiki documentation.
Perhaps the question we should be asking ourselves is which one to fix
up and how... sigh.)

Andrew Chadwick

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