Re: [sumo-dev] plexe.setFixedLane not working properly SUMO

[Michele Segata <michele.segata@xxxxxxxx>]

Dear Ankit,

setFixedLane has been implemented with an highway in mind, when you want 
to have a platooning vehicle stick to a lane instead of changing lane. 
The behavior in other contexts has never been tested. I also believe 
that what Jakob suggests is what is actually happening. If you set the 
lane to be an index > 0 but there is only one lane exiting the 
roundabout, then the vehicle doesn't find the corresponding lane to exit 
and it remains stuck. To test whether this is really the case, you could 
set the lane of a vehicle fixed to 0 with setFixedLane. If the vehicle 
exits the roundabout, then this is really the issue.

Best,
Michele

On 27/04/2022 10:02, Jakob Erdmann wrote:
> I've never used Plexe and can only guess how  setFixedLane is implemented.
> My guess is that when using laneIndex > 0 this would make the vehicle 
> move to the inside lane of the roundabout and keep it there.
>
>
> Am Fr., 22. Apr. 2022 um 07:59 Uhr schrieb Ankit Jatiya 
> <akj0147@xxxxxxxxx <mailto:akj0147@xxxxxxxxx>>:
>
>     But when a vehicle enters roundabout then also it is changing lane,
>     but there is no problem. Only problem is while exiting the roundabout.
>
>     On Fri, Apr 22, 2022, 11:24 AM Jakob Erdmann <namdre.sumo@xxxxxxxxx
>     <mailto:namdre.sumo@xxxxxxxxx>> wrote:
>
>         Vehicles typically have to move to the outer lane to exit the
>         roundabout. This means you must allow some lane changing while
>         inside the roundabout. One solution would be to let your
>         management system trigger the change to the outside lane using
>         traci.vehicle.changeLane.
>
>         Am Fr., 22. Apr. 2022 um 07:49 Uhr schrieb Ankit Jatiya
>         <akj0147@xxxxxxxxx <mailto:akj0147@xxxxxxxxx>>:
>
>             Hello,
>
>             I am trying to implement a roundabout management system in
>             SUMO.  I want to keep lanes fixed for vehicles.such that
>             vehicles that want to go straight are in middle lane, those
>             who want to turn right are in right lane and those who want
>             to turn left are in left lane.
>             I tried using plexe.setFixedLane but it has a problem.
>             Vehicle enter the roundabout successfully but when it is
>             time to leave the roundabout, it gets stuck just before
>             leaving the roundabout in its lane.
>             Is there some other way to keep lane fixed which avoid this
>             problem?
>
>             Thank You & Regards
>
>             Ankit
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--
Michele Segata, PhD
Assistant Professor, Faculty of Computer Science
University of Bolzano, Italy
https://www.inf.unibz.it/~segata/