Hello,
this kind of counter-lane-change-deadlock is known to occur in very short
weaving sections and the solution is outline here:
https://sumo.dlr.de/docs/Simulation/Motorways.html#combined_on-off-ramps
In your situation there might be something else going on because the road
ahead of the off-ramp should be long enough to permit both streams to
exchange their lanes via regular lane changing.

regards,
Jakob

Am Di., 19. Okt. 2021 um 09:02 Uhr schrieb Alejandro Rodríguez Sánchez <
[email protected]>:

> Hi everyone,
> I am using sumo for simulating traffic in urban areas and I've encountered
> an issue I haven't seen before.
> It happens that, when running the simulation (after computing routes from
> traffic count data with flowrouter.py), a certain vehicle has to exit a
> three-lan motorway from an one-lane off-ramp. However, the vehicle enteres
> the junction in the middle lane of the motorway, not taking the off ramp
> and so the vehicle cannot follow its route and stops at the middle of the
> road, producing a massive jam in the simulation. This seems to happen to
> all vehicles in this particular edge.
> In the image, I've highlighted the route of the vehicle in brown.
> The vehicles in the middle lane want to exit the motorways, going left,
> while the vehicles in the left line want to go straight, being all of them
> in the wrong lane.
>
> I have observed this anomalous behaviour both in versions 1.9.2 and 1.10.0
> of sumo.
>
> I have tried setting the -ignore-junction-blocker <TIME> option in sumo
> but it does not work in this case, the vehicle continues being stopped and
> the following ones are jammed behind it. What can I do to avoid this
> problem?
>
> Kind regards,
> Alejandro
> --
> Alejandro Rodríguez Sánchez
> PhD student
> CIEMAT // Universidad Complutense de Madrid
> 28040 Madrid
> email: [email protected]
> Website: https://alexrsanchez.github.io/en/
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