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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