I need a surgeon to fix this intersection,
https://www.openstreetmap.org/edit#map=21/24.1400958/120.6657932
so the two lanes of Wuquan Rd. don’t collide with each other.
Mom said that’s dangerous.
Thanks.
I don’t see anything inherently wrong. Some people like the “pencil tip” of the bottom road to extend through the intersection so there’s a triangle in the middle, but this version works and should route fine. In this instance, because it’s a T intersection, the N-S road could also be mapped parallel through the intersection and make a square.
Here is a much better representation of the Ground Truth™ at such intersections,
The truth is north and southbound lanes do not have to take turns going through a single point, like there was some kind of one-lane bridge.
One of the benefits of representing the Ground Truth is e.g.,
will faithfully stitch together each of the two lanes separately, from a pile of segments.
I would edit it myself, but I always end up causing more damage, so will need the help of an experienced surgeon here.
Like @pkoby I do think there is nothing wrong with this crossing, nothing is colliding. If you still think there is a problem, please indicate the OSM-ID’s of the two ways that are colliding.
For the second crossing, is this what you would better like?
I do not think this is better.
If this is not what you want, please describe better what you want.
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I am saying I hate “pencil tips”.
I’m saying please get rid of the pencil tip in my first photo,
don’t make things worse by adding it to my second photo.
Pencil tips might make sense when describing the entrance to an ant hive, when each ant, no matter when entering or leaving, has to take turns.
But the Ground Truth™, in modern cities at least, is each lane is independent. Thanks.
Took me quite some time what are pencil tips but I think I now understand.
Do you like this better?
I now see at least 3 “pencil tips”, I marked them with yellow.
With this a route better aligns with the actual route a car drives, the biggest plus is for a car coming from West on the 五權西路一段 taking a right to 五權路 (somehow the English name is Wuquan W. Rd. and Wuquan Road)
While I see a plus it makes things more complex and, yes, there are quite some bus routes over the crossing that have you should take care of when updating the crossing.
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That looks perfect, doctor!
You can wheel me right in for the surgery. Here’s my health card. P.S.,
coming from East
(You meant west.)
I don’t think this is better. This violates the idea that highways should not be drawn separately unless there is a physical barrier between them.
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So, at every intersection in the world all roads shall join at one single point?
Agreed on that but this is for a crossing (not a highway) with all three incoming ways having a physical barrier between them.
Do you think what I proposed here is better than the original situation?
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The guideline is that highways should be mapped separately if there is physical separation, but it doesn’t strictly imply the reverse.
See e.g. recent thread Breaking the physical separation rule for some road markings
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I think this thread is ridiculous. First of all, no one would argue that intersections should be mapped like this:
Obviously, the separate ways of dual carriageways can be continued across intersections.
But that doesn’t mean that standard turn lanes or turn movements justify their own separate highways. Take a look at a simple intersection like this
and imagine a vehicle wants to make a left turn as shown in the graphic. Does that mean they will follow the blue arrows exactly? Well, of course not, that’s not how making a turn works. That does not justify adding turn-specific highways
since those extra roads have no correspondence on the ground. We’re mapping roads, after all, and not possible vehicle maneuvers. Likewise, paint-only turn lanes are also not mapped as separate highways. So this does not make sense. If data consumers want to display the route for cars more precisely, then they will need to take into account that turn maneuvers are not done at 90° angles, not mappers.
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With my earlier proposal marked as solution and based on the further discussion I did update the crossing keeping in mind the bus routes.
Added turn restrictions and fixed oneway in a second changeset.
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