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

2022-03-04 Thread Benjamin Ceravolo
Regarding classing paint as a barrier, you wouldn't map a bicycle lane as a
cycle way if it is only a painted line (
https://www.mapillary.com/app/?pKey=285967329802439) but if there is a
barrier (Kreb, Armco, parked cars, etc.) it would be mapped as a separate
cycleway (https://www.mapillary.com/app/?pKey=594425938270748).

Also no one (to my understanding) has a problem with bus lanes being
tagged on the road's way and not as a separate bus only road.

Ben.

On Sat, 5 Mar 2022 at 15:03,  wrote:

> I really hadn't expected people here to have such delusions about some of
> the cornerstones of highway mapping in OSM which have been firmly
> established for over a decade.
>
> To quote the wiki (
> https://wiki.openstreetmap.org/wiki/Editing_Standards_and_Conventions#Divided_highways
> ):
>
> A divided highway (also separated highway) is any highway where traffic
> flows are physically separated by a barrier (e.g., grass, concrete, steel),
> which prevents movements between said flows.
>
> The concept of what constitutes "physical separation" has been very firmly
> established. And simply paint on the road surface isn't it. There are
> plenty of tags available to record information about legal restrictions
> imposed by paint. Splitting the way is not one of them.
>
> Also, you somehow seem to be under the misconception that OSM (name
> notwithstanding) is a *map*. It's not. It's a database with geospatial
> information.
>
> When you are editing OSM, you are not drawing a map. You are recording
> geospatial information, abstracted by established tagging patterns. Some of
> the data consumers of that information, after picking, choosing, and
> interpreting while render a map derived from that information.
>
> Cheers,
> Thorsten
>
> -Original Message-----
> From: cleary 
> Sent: Saturday, 5 March 2022 09:38
> To: OpenStreetMap 
> Subject: Re: [talk-au] "Don't split ways if there is no physical
> separation"
>
> Hello again Dian
>
> If you cannot move left and a car to left of you cannot move right, then I
> would suggest you are physically separated.  It does not have to be a
> concrete barrier one metre high to be "physical separation". Try telling a
> police officer or a magistrate that the unbroken painted line did not
> really constitute a physical separation of ways.
>
> The maxim is "Don't split ways if there is no physical separation".
> Undoubtedly an unbroken painted line on a roadway frequently constitutes
> "physical separation".
>
> If the community wants to change "physical separation" to something else,
> such as a barrier constructed of specified materials to a specified minimum
> height,  then I plead for accuracy and usefulness of the map as guiding
> principles when considering any change to the guideline.
>
> In regard to the statement that  '' ... would demand each lane to be drawn
> as a separate highway", I would say that nothing is "demanded".  Every map
> involves decisions about what is included and what is excluded. If we
> mapped every insignificant object, the map would be so cluttered that it
> would be useless. We do not usually map every individual tree in a forest.
> However in some instances individual trees are mapped, where useful. The
> creators of maps are always exercising judgement in what is included or
> omitted. Not every physical item in the world, including every strip of
> paint, "demands" to be mapped.
>
>
>
>
>
> On Sat, 5 Mar 2022, at 8:46 AM, Dian Ågesson wrote:
> > 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, ianst...@iinet.net.au wrote: This
> &g

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

2022-03-04 Thread iansteer
Thanks for the tip about the "change" tag.

 

So here is what I've done - does it sound right?

 

- in the section where the slip lane joins the 2-lane through road (where
lanes=3), I have added:  "change:lanes=not_right|not_left| "  

(this hopefully means that the left hand lane cannot change lanes to the
right, and the middle lane cannot change lanes to the left)

 

- then in the next section where turn left and right slip lanes are added
(where lanes=5), I have added"  "change:lanes= |not_right|not_left|| "

(which hopefully means: the left slip lane can do as it pleases, the 2nd
lane (the left-most of the 3 through lanes) cannot change right, the middle
of the 3 through lanes cannot change left, and the other 2 right-most lanes
can do as they please)

 

I'd be very interested to see what a routing engine does at the point where
the slip lane joins the 2 through lanes.  That is, does it associate the
slip lane with the left-most of the through lanes and hence know a vehicle
can't jump from the slip lane to the centre lane at the instant - or do the
lanes go into a "melting pot" with no association?  Similarly where lanes=3
changes to lanes=5 where the turn left and right slip lanes are added.

 

Ian

 

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

2022-03-04 Thread osm.talk-au
I really hadn't expected people here to have such delusions about some of the 
cornerstones of highway mapping in OSM which have been firmly established for 
over a decade.

To quote the wiki ( 
https://wiki.openstreetmap.org/wiki/Editing_Standards_and_Conventions#Divided_highways
 ):

A divided highway (also separated highway) is any highway where traffic flows 
are physically separated by a barrier (e.g., grass, concrete, steel), which 
prevents movements between said flows.

The concept of what constitutes "physical separation" has been very firmly 
established. And simply paint on the road surface isn't it. There are plenty of 
tags available to record information about legal restrictions imposed by paint. 
Splitting the way is not one of them.

Also, you somehow seem to be under the misconception that OSM (name 
notwithstanding) is a *map*. It's not. It's a database with geospatial 
information. 

When you are editing OSM, you are not drawing a map. You are recording 
geospatial information, abstracted by established tagging patterns. Some of the 
data consumers of that information, after picking, choosing, and interpreting 
while render a map derived from that information.

Cheers,
Thorsten

-Original Message-
From: cleary  
Sent: Saturday, 5 March 2022 09:38
To: OpenStreetMap 
Subject: Re: [talk-au] "Don't split ways if there is no physical separation"

Hello again Dian

If you cannot move left and a car to left of you cannot move right, then I 
would suggest you are physically separated.  It does not have to be a concrete 
barrier one metre high to be "physical separation". Try telling a police 
officer or a magistrate that the unbroken painted line did not really 
constitute a physical separation of ways.

The maxim is "Don't split ways if there is no physical separation". Undoubtedly 
an unbroken painted line on a roadway frequently constitutes "physical 
separation".  

If the community wants to change "physical separation" to something else, such 
as a barrier constructed of specified materials to a specified minimum height,  
then I plead for accuracy and usefulness of the map as guiding principles when 
considering any change to the guideline.

In regard to the statement that  '' ... would demand each lane to be drawn as a 
separate highway", I would say that nothing is "demanded".  Every map involves 
decisions about what is included and what is excluded. If we mapped every 
insignificant object, the map would be so cluttered that it would be useless. 
We do not usually map every individual tree in a forest. However in some 
instances individual trees are mapped, where useful. The creators of maps are 
always exercising judgement in what is included or omitted. Not every physical 
item in the world, including every strip of paint, "demands" to be mapped.  





On Sat, 5 Mar 2022, at 8:46 AM, Dian Ågesson wrote:
> 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, ianst...@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 lane

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

2022-03-04 Thread Kim Oldfield via Talk-au
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=145.24219080806=17=303763387865756=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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Re: [talk-au] "Don't split ways if there is no physical separation"

2022-03-04 Thread Luke Stewart
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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Re: [talk-au] "Don't split ways if there is no physical separation"

2022-03-04 Thread cleary
Hello again Dian

If you cannot move left and a car to left of you cannot move right, then I 
would suggest you are physically separated.  It does not have to be a concrete 
barrier one metre high to be "physical separation". Try telling a police 
officer or a magistrate that the unbroken painted line did not really 
constitute a physical separation of ways.

The maxim is "Don't split ways if there is no physical separation". Undoubtedly 
an unbroken painted line on a roadway frequently constitutes "physical 
separation".  

If the community wants to change "physical separation" to something else, such 
as a barrier constructed of specified materials to a specified minimum height,  
then I plead for accuracy and usefulness of the map as guiding principles when 
considering any change to the guideline.

In regard to the statement that  '' ... would demand each lane to be drawn as a 
separate highway", I would say that nothing is "demanded".  Every map involves 
decisions about what is included and what is excluded. If we mapped every 
insignificant object, the map would be so cluttered that it would be useless. 
We do not usually map every individual tree in a forest. However in some 
instances individual trees are mapped, where useful. The creators of maps are 
always exercising judgement in what is included or omitted. Not every physical 
item in the world, including every strip of paint, "demands" to be mapped.  





On Sat, 5 Mar 2022, at 8:46 AM, Dian Ågesson wrote:
> 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, ianst...@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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>>> https://lists.openstreetmap.org/listinfo/talk-au 
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Re: [talk-au] "Don't split ways if there is no physical separation"

2022-03-04 Thread Graeme Fitzpatrick
 On Sat, 5 Mar 2022 at 06:48, 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.
>

Agree entirely, except for saying that it's a physical barrier that
*shouldn't* be traversed!

On Sat, 5 Mar 2022 at 07:50, Dian Ågesson  wrote:

> 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.
>
Sure, that can happen, but if the road is blocked, & Police tell you to,
you can also drive the wrong way down a one-way street / lane, but we still
map that street as one-way against you!

Thanks

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

2022-03-04 Thread 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, ianst...@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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Re: [talk-au] "Don't split ways if there is no physical separation"

2022-03-04 Thread 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, ianst...@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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> Talk-au@openstreetmap.org
> https://lists.openstreetmap.org/listinfo/talk-au

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

2022-03-04 Thread osm.talk-au
change:lanes=* can represent that solid line. While that would implicitly 
define the inability to turn right, it can in addition be made explicit using a 
turn restriction relation with ways as via, specifically:



type=restriction

restriction=no_turn_right
from: https://www.openstreetmap.org/way/670700854

via: https://www.openstreetmap.org/way/382839842

via: https://www.openstreetmap.org/way/670682584

via: https://www.openstreetmap.org/way/574613452

via: https://www.openstreetmap.org/way/670674733

via: https://www.openstreetmap.org/way/574613451

to: https://www.openstreetmap.org/way/770019512

 

 

 

From: nwastra  
Sent: Friday, 4 March 2022 22:12
To: ianst...@iinet.net.au
Cc: talk-au@openstreetmap.org
Subject: Re: [talk-au] "Don't split ways if there is no physical separation"

 

Here is the osm location

 

https://www.openstreetmap.org/#map=15/-31.9881/115.9857





On 4 Mar 2022, at 9:59 pm, ianst...@iinet.net.au <mailto:ianst...@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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Re: [talk-au] "Don't split ways if there is no physical separation"

2022-03-04 Thread nwastra
Here is the osm location

https://www.openstreetmap.org/#map=15/-31.9881/115.9857

> On 4 Mar 2022, at 9:59 pm, ianst...@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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[talk-au] "Don't split ways if there is no physical separation"

2022-03-04 Thread iansteer
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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