[talk-au] "Don't split ways if there is no physical separation"

Kim Oldfield osm at oldfield.wattle.id.au
Sat Mar 5 00:42:39 UTC 2022


To add to the ambiguity of what physically separate means I'll highlight 
the roudabout joining Wonga Road and Oban Road:

https://www.openstreetmap.org/edit#map=19/-37.79463/145.24154

Here the separation between lanes is similar to a long thin speed hump - 
you can drive over it, but it is a physical bump to discourage people 
from cutting corners:

https://www.mapillary.com/app/?lat=-37.794785108333&lng=145.24219080806&z=17&pKey=303763387865756&focus=photo

To make it even more confusing these raised humps don't extend the full 
distance of the approach, and they could be mapped as a mix of two 
separate ways, and a two lane way just before the roundabout - but this 
would be getting too pedantic and I can see no benefit of doing so.

Personally, I'm less concerned about how these ambiguous cases are 
mapped - whatever we decide you will always be able to find an middle 
case that could be mapped either way.

What is more important is getting the obviously wrong (see other thread) 
turning lanes fixed. I suspect a lot of the problem here is that id and 
the standard OSM render don't visually show lane tags. It is easy to 
visually map separate lanes as separate ways which then looks "good" - 
even though this is wrong by OSM standards.

Regards,

Kim

On 5/3/22 10:46, Luke Stewart wrote:
> There are many situations in Australia where you are permitted to 
> cross an unbroken white line (for instance, moving to a special 
> purpose lane). The wiki is pretty unambiguous, "where traffic flows 
> are physically separated by a barrier (e.g., grass, concrete, steel), 
> which prevents movements between said flows". Emergency vehicles are 
> an obvious class where crossing legal barriers such as lines on the 
> road is perfectly fine.
>
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