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

[Dian Ågesson]

Hi Cleary,

Two points:

Paint isn't a barrier. Vehicles can, and do, traverse over paint; it's 
legal in many cases if there is a road blockage, for example. Being 
unable to change lanes doesn't make a single road into two roads. If I 
can't merge left then I'm not travelling on a different road than the 
car next to me.

Using legal separation to justify splitting the ways is also a poor 
standard. At most traffic light intersections, you can't change lanes 
past a certain point.  The method you're describing would demand each 
lane to be drawn as a separate highway.

Dian

On 2022-03-05 07:44, cleary wrote:

> 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
>> _______________________________________________
>> Talk-au mailing list
>> Talk-au at openstreetmap.org
>> https://lists.openstreetmap.org/listinfo/talk-au
> 
> _______________________________________________
> Talk-au mailing list
> Talk-au at openstreetmap.org
> https://lists.openstreetmap.org/listinfo/talk-au
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/talk-au/attachments/20220305/261c1492/attachment.htm>