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

[cleary]

Paint is physical. It can be seen. It is not just a psychological or imaginary concept.  If one is driving a motor vehicle and abiding by the law then, in my understanding, an unbroken painted line on the road is a physical barrier that cannot be traversed.


On Fri, 4 Mar 2022, at 10:55 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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