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osmlab / maproulette

This is a very old version of MapRoulette. Find the current version at osmlab/maproulette3 and the backend at maproulette/maproulette2
http://maproulette.org/
Apache License 2.0
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Proposed challenge: ways exiting a roundabout where a way enters the roundabout #332

Closed MaartenDeen closed 7 years ago

MaartenDeen commented 9 years ago

I got the idea from bug #1395 from the osrm buglist.

The OSM wiki on roundabouts says: "Each road has to be connected with the roundabout in a separate node, i.e. between these nodes a segment of the roundabout is required. Thus routers can safely recognise that a section of the roundabout has to be driven through.". IMHO this is a very reasonable demand. If you can bypass a roundabout without traversing it, you should map it without touching the roundabout. In other cases, I do not see the need to make an entrance to and exit from a roundabout from the same node. This is also an easy fix: if you're unsure of the exact layout of the roundabout, add a very small section inbetween. Roads do not necessarily need to enter and exit a roundabout at fixed 45 degree angles (e.g. when from 4 directions dual carriageway roads enter).

It would improve the routing directions a great deal.

mvexel commented 9 years ago

Interesting idea. Who knows how to implement this as a challenge?

kreed commented 9 years ago

Osmose has a check for this called "roundabout shortcut"

http://wiki.openstreetmap.org/wiki/Osmose/issues#3010

jwass commented 8 years ago

Hi @MaartenDeen @mvexel - I was just revisiting that OSRM roundabout issue I wrote earlier in the year and just found this discussion.

I was able to extract suspect roundabouts in the US - @Rub21 created a to-fix task that's available now on web and the to-fix JOSM plugin. http://osmlab.github.io/to-fix/#/task/roundaboutusa

martijnv-telenav commented 8 years ago

to-fix beat us to it!