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Re: [sumo-user] priority lane
Never attempt to modify network files directly (https://sumo.dlr.de/docs/FAQ.html#i_made_changes_to_the_netxml-file_but_it_did_not_work_as_expected_why)
The next release of SUMO (and also the latest nightly version) supports setting the roundabout attribute directly in netedit. 
(If it ever comes up again, attributes with missing netedit support can also be set by netconvert when loading a .net.xml file together with a .nod.xml or .edg.xml patch file).


Am Di., 20. Jan. 2026 um 21:44 Uhr schrieb Pedro Oliveira <pedro.engenhariae@xxxxxxxxx>:
Good afternoon!

I managed to solve it.

Initially, I changed the priorities in netedit. In the XML file, I edited: roundabout = 0, changed the states "m" and "M", and deleted the roundabout definition that defined the nodes directly in the XML.

In the end, this still hadn't solved it.

Then I opened the XML in netedit and made a random edge and then deleted it just so that netedit would ask to save the file. This last change didn't modify my manual modifications.

After that, I ran the simulation in SUMO and it worked.

Regards,

Pedro Oliveira

Em seg., 19 de jan. de 2026 às 20:16, Pedro Oliveira <pedro.engenhariae@xxxxxxxxx> escreveu:
Good evening!

I'm facing a similar situation.

I made a manual change to the .net.xml file and set roundabout = 0, and also made a change to states "M" and "m". Visually, in Sumo, the priority was changed.

image.png

However, when running the simulation, the preference in practice was not changed.
image.png

Sds,

Pedro Oliveira


Não contém vírus.www.avast.com

Em ter., 28 de out. de 2025 às 14:59, Jakob Erdmann via sumo-user <sumo-user@xxxxxxxxxxx> escreveu:
The very latest development version (v1_24_0-1618+) supports node attribute roundabout="0" for this purpose but you will need to set it in plain-xml input because netedit support is still lacking.

Am Di., 28. Okt. 2025 um 16:54 Uhr schrieb Morgi Diva via sumo-user <sumo-user@xxxxxxxxxxx>:

Dear friends, I need to change the priority on these roads, but changing it in the settings isn't affecting the simulation. Does anyone know if there's another way?

The image below shows the road that should have priority. 

image.png
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