On Sat, Sep 8, 2018 at 8:59 AM Chris Hathcock <chris.hatc...@gmail.com> wrote:
> Without looking at the intersections in question, I suspect they could be > traffic calming circles. These are common in residential areas. They're > frequently uncontrolled and unsigned and the purpose of them is to slow > down traffic, not to improve traffic flow like a roundabout. > > I agree with Albert that junction=circular is the way to go. However, I'm > unsure of whether it would be better to just tag the intersection node or > draw out the circle and add 4 nodes as the wiki seems to suggest. I think > you can argue it either way, there's technically a roundish right of way, > but all of the ones I've seen are basically a hole cut in the middle of an > otherwise straight intersection. Sometimes the circle is small enough that > you can swerve around it if you're going straight. It's not something I've > tried to map before so I haven't given it much thought. > The location Marian provided all look like roudabouts but without any directional arrows in the pavement. Seattle has a bunch of island calming intersections that I've mapped in the past with just a node at the intersection. See https://www.google.com/maps/place/Wallingford,+Seattle,+WA/@47.6580491,-122.3397932,54m/data=!3m1!1e3!4m5!3m4!1s0x54901457beb77743:0x3352f3c14438fcbe!8m2!3d47.661258!4d-122.3298912 for an example. I believe that the city ordinance allows for left turn without going through the circle. All of the examples Marian gave I would map as a circle with a oneway=yes along with a note for help from a local mapper to verify. Going one way in the circle wouldn't be wrong, but making it two way could be wrong. Best, Clifford > @osm_seattle osm_seattle.snowandsnow.us OpenStreetMap: Maps with a human touch
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