[talk-au] "Don't split ways if there is no physical separation"
nwastra
nwastra at gmail.com
Fri Mar 4 12:12:13 UTC 2022
Here is the osm location
https://www.openstreetmap.org/#map=15/-31.9881/115.9857
> On 4 Mar 2022, at 9:59 pm, iansteer at iinet.net.au wrote:
>
>
> This query was triggered by the following comment in another thread, but I’ll start a new thread so as not to distract the original.
>
> “ ’Don't split ways if there is no physical separation’ is one of the core tenets of highway mapping in OSM.”
>
> My query is about how to correctly map an intersection in Perth while abiding by the above. I will try to describe the situation as best I can without being able to resort to a sketch:
>
> - there is a junction between 2 major highways in Perth (Roe & Tonkin Highways)
> - there is a slip road off one (Roe heading west) that merges with the 2 lanes of the other (Tonkin heading south)
> - from the merge point there are 3 lanes (the slip lane + the 2 through lanes)
> - from the merge point, there is no physical barrier down to the traffic lights at the next intersection (Hale Rd - which is quite close – hundreds of metres)
> - however there is a solid white line between the slip lane and the 2 continuing lanes – right to the next intersection
> - this means you cannot legally come off the slip lane and turn right at the next intersection (Hale Rd) because you cannot legally cross the solid white line
>
> This has currently been mapped “as normal”, ie 1 slip lane joining a 2 lane road, becoming 3 lanes after the merge point.
>
> Other than maintaining the slip road as a separate way right to the next intersection (with a no right turn), how else would this be mapped so people coming off the slip road cannot turn right at the next intersection?
>
> Ian
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