Good afternoon everyone,
I am building a complex intersection that is causing a complete traffic collapse and I would like advice on the correct modelling approach. I am using a network imported from OSMWebWizard, SUMO version 1.25
As seen in the images, the intersection is a large roundabout with islands and multiple entry/exit points, the TLS are defined in the same position as reality and are 'actuated'. The current SUMO model has each junction imported as a separate TLS (img. 2).
I have already tried joining all TLS nodes under a single controller using the 'Join' function in netedit and resetting the program, but the collapse persists.
Additionally, I am observing a lane distribution problem: vehicles entering the roundabout from the bottom approach are concentrating on the rightmost lanes instead of distributing across all available lanes. This is likely related to the downstream connections only allowing continuation from those lanes, but I would like to confirm whether this is a connection issue or a lcStrategic/lcContRight issue in the vType definition.
I have the following questions regarding the issue:
1. After joining all TLS under a single controller and resetting the program, the auto-generated phases still cause collapse. What is the recommended approach to manually define the phase coordination between entry signals and interior circulation signals for a roundabout of this complexity?
2. Regarding the lane distribution problem at the bottom entry: should this be fixed by correcting the downstream connections in netedit, or by tuning vType lane-change parameters (lcStrategic, lcContRight)? Or both?
3. Are there specific junction modelling issues that are commonly wrong in roundabouts with TLS after OSM import that I should systematically check?
4. Would it make more sense to remove the TLS from the interior nodes of the roundabout and keep signals only at the external entry/exit points, using priority rules for the internal circulation?
I am happy to share the network file, TLS program XML, or any additional files if that would help diagnose the issue.
Thank you very much in advance.
Gabriel
