Help with turn restrictions

10inchesinurmum · 2024-07-12T04:41:34.660Z

Hello, how do I properly tag the “only right turn”/“no left turn” restriction on [this route](https://map.project-osrm.org/?z=18&center=46.250136%2C14.347876&loc=46.250784%2C14.347914&loc=46.249114%2C14.347839&hl=en&alt=0&srv=1)?

image1462×1386 101 KB

Thank you for your help

n76 · 2024-07-12T05:01:37.074Z

What editor are you using. JOSM has a turn restriction plug-in that makes this pretty easy.

If using iD, my guess it this fairly common task has some support and someone else more familiar with it will also answer.

SekeRob · 2024-07-12T06:07:00.369Z

Hi,

here’s a short demo done by mapbox using the ID Editor.

Medium – 29 Jun 17

Simple Editing for Turn Restrictions in OpenStreetMap

The new version of iD, the web editor for OpenStreetMap, makes it even simpler to add turn restrictions to OpenStreetMap. Click an intersection where you want to add a turn restriction, select the…

Reading time: 1 min read

I briefly looked and the 412 needs cutting where the residential road joins the primary road before creating the turn restriction. Looks like at the turn point a ‘only right turn’ is all that’s needed.

ManuelB701 · 2024-07-12T06:18:37.590Z

I tend to create restrictions without any sort of guidance but the advantage is that the procedure is general for every editor. In any case, the steps are:

First and foremost, split up the road at the intersection if it isn’t so already.
Select all the necessary parts (start way, via node and destination way) where the restriction applies (in that case, the minor street is the start, the major road the destination and the via-node is what connects both of them)
Create a relation using these members and select the applying relation (I recommend chosing to replicate the sign i.e. if right is forbidden, use “no right turn” but if left is mandatory, use “only left turn” instead^[1]).
Set up the aforementioned members as ~~start~~ from, via and end, respectively.

This is the basic way of adding turn restrictions in any editor basically but there are special tools for the individual editors which should make it easier (iD has one which appears if you select an intersection node).

Edit: Fixed error.

it should be noted that depending on the country, turn restrictions only appear in the mandatory form so you have to its negative e.g. if only straight ahead and right turns are permitted, it means that right turns are forbidden so the restriction to chose is no right turn. See Wiki for more information ↩︎

chris66 · 2024-07-12T07:10:15.564Z

ManuelB701:

members as start, via and end, respectively

No, from, via, to.

10inchesinurmum · 2024-07-19T04:20:01.986Z

Could you please check if what I’ve done is correct?

mueschel · 2024-07-19T10:22:20.206Z

10inchesinurmum:

OpenStreetMap Routing with Open Source Routing Machine

The two relations look fine. Btw, it’s helpful to link directly to the object on osm.org: Way: ‪Koroška cesta‬ (‪455056617‬) | OpenStreetMap

There’s still a ‘restriction’ tag on the road itself which should be removed.

10inchesinurmum · 2024-07-22T00:13:55.222Z

By looking at the route it still uses the left turn, so Im not sure what ive done wrong.

chris66 · 2024-07-22T05:31:46.838Z

It may take a week or so until the Routers are updated.

In Vahalla Routing it’s already working: OpenStreetMap
Other direction: fuel-stop is used for Turn: OpenStreetMap

chris66 · 2024-07-24T16:26:03.597Z

OSRM and graphhopper (car) are now also updated. So you can check if the routing is working as expected.

10inchesinurmum · 2024-07-25T11:21:21.739Z

I saw, perfect, thanks for the help! I have a bit more complicated case now: OpenStreetMap

How would you restrict 180 degree turn on this road?

image856×1182 115 KB

Mammi71 · 2024-07-25T11:36:37.556Z

I don’t know the Slovenian road traffic regulations, but it doesn’t look as if turning is prohibited at this junction.

Otherwise it follows the same principle: from - via - to.
The only difference is that a node is not assigned the role via, but this short way Levstikova ulica.

10inchesinurmum · 2024-07-26T05:26:10.186Z

It is illegal to do 180 turn in “heavier traffic roads”. I have managed to do the restriction, thank you!