On 11-06-16 04:16, James Mast wrote:
I've been using the "turn:lanes:*=none;slight_right" &
"slight_left;none" tags to indicate which side a new lane has been added
on a highway when going from 1 to 2 lanes (sometimes
"slight_left;slight_right" if the original lane is centered between the
two new lanes). How else are people to properly identify which side the
new lane is being added to?
NOO!
That's what the transit:-tag is for:
<https://wiki.openstreetmap.org/wiki/Proposed_features/transit>
All lanes and road attributes that I know of are neatly summed up - not
on the OSM wiki but the JOSM wiki:
<https://josm.openstreetmap.de/wiki/Styles/Lane_and_Road_Attributes>.
From there links point to the OSM wiki.
Take a look at this way (
https://www.openstreetmap.org/way/419799887 ) and take a look at the
Bing imagery and look at the 'turn:lanes:forward' tag, and you'll see
how this can, and would be valid.
The way I see it, the only "turn:lane" markers that signify a lane
change is merge_with_left/merge_with_right. All the others signify that
you can choose between different ways!
The way I think this should be tagged is:
no turn:lanes
transit:lanes:forward=continue;new_on_left
(the continue is optional in this case).
See for example Way 415775038
Which has one lane, but the next segment has two lanes (one through lane
and a right turn lane)
"transit:lanes"="continue;new_on_right"
(Note that this is not a good example: the Bing image isn't current and
the lane will be changed next monday, so I'll probably update it tuesday
evening)
It's allowing the router to know that
a new lane is being added when combined with the next way (
https://www.openstreetmap.org/way/419799886 ) which has the
"lanes:forward=2" tag. It also allows the routers to properly tell
people to get in the left lane if just ahead, there's a left turn they
need to make.
OSMand already does that with proper turn:lanes. It gives a
preannouncement of which lanes you should go to:
<https://dl.dropboxusercontent.com/u/240848/OSM/Screenshot_2015-11-23-20-36-55.png>
(The arrows are yellow before you are on the way, and green if you are
on the way that has the turn:lanes)
As far as I know, OSMand doesn't use transit:lanes.
BTW, the "Lanes and road attribute" mappaint style doesn't use the
transit:lanes for rendering, but it does a check on them, giving a
warning if an incorrect transit:lanes is used.
Tijmen
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