[talk-au] Turn lanes review

Andrew Harvey andrew.harvey4 at gmail.com
Thu Feb 7 12:57:08 UTC 2019

At the Picton Road overpass you've got turn:lanes=through|right, only
use through if there is a forward arrow marking, if not use none, so
turn:lanes=none|right. Looks like you've done this everywhere, so
should be fixed.

If the road is oneway you don't need lanes:forward or
turn:lanes:forward, you can just use lanes and turn:lanes. Only for a
two way road do you need to add :forward and :backward. Admittedly it
doesn't harm but for a oneway road there you have both lanes=2 and
lanes:forward=2, having these two tags which do the same thing, when
both are already well supported and accepted tags just leads to
confusion later on. Someone might try to change this when things
change on the ground but only update on tag and then now it's
conflicting. So best to just drop the :forward and :backward on oneway

In my opinion the tag is mapping the lane markings, so at Picton road
heading south east, then on the Hume Motorway Onramp to head north
east, the lane marking is a hard 90degree left, but physically it's
only slight left, you've mapped it as slight left. I think it should
be left as per the ground marking. The physical slight left can always
be determined from the geometries anyway. I'm kind of being pedantic


That's all I noticed, apart from that looks good! End of the day even
if you're not 100% sure, so long as you have some idea and acting in
good faith just go ahead and make the upload, then if you want post
the changeset and ask for feedback as it's easier to review an
uploaded changeset with the tools available. Just my opinion.

On Thu, 7 Feb 2019 at 16:20, David Wales <daviewales at disroot.org> wrote:
> Dear Australian Mappers,
> I have completed my first attempt at adding lane and turn:lane tagging
> to a freeway intersection. However, I'm not entirely confident that I'm
> doing it right!
> Please help me to fix any issues before I upload it!
> Here is a link to the changeset:
> https://www.dropbox.com/s/zvq48ml34bcc6y6/Picton%20Road%20Freeway%20Turnlanes.osm.zip?dl=0
> Regards,
> David Wales
> _______________________________________________
> Talk-au mailing list
> Talk-au at openstreetmap.org
> https://lists.openstreetmap.org/listinfo/talk-au

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