Re: [sumo-user] Issue with Changing Traffic Light Type from 'Static' to

[Jakob Erdmann <namdre.sumo@xxxxxxxxx>]

1. The current code that defines NEMA controllers only handles common 3-arm and 4-arm intersections. The plain junction is "special" because the side roads don't have straight movements and the complicated junction is also beyond what this algorithm was meant to do.  Currently, the only work-around is to specify the states and respective NEMA attributes for such intersections manually as described in https://sumo.dlr.de/docs/Simulation/NEMA.html and then load that program from an additional xml file into the simulation.

2. This threshold was chosen as the exact middle betwene 90 and 180 degrees for discriminating between "straight" and "intersecting" roads.  (two straight roads may have a common phase whereas two intersecting  roads should not).

regards,

Jakob

Am Mi., 5. Feb. 2025 um 13:44 Uhr schrieb Karagounis Vassileios via sumo-user <sumo-user@xxxxxxxxxxx>:

Dear all,

 

While changing the traffic light type from 'static' to 'NEMA' in SUMO NetEdit, the process did not complete successfully. 
Instead, the program saved the type as 'Actuated' as a fallback, rather than 'NEMA'.

 

The warning message we encountered states:
"Generating NEMA phases is not supported for traffic light 'tls' with 8 incoming edges. Using tlType 'actuated' as fallback."

 

Additionally, upon reviewing the C++ code, we noticed that in the process of grouping opposite edges, a value of 135 degrees is used. 
This occurs in the file "NBOwnTLDef.cpp", at line 400. Could you clarify the reason for using this specific value?

 

For reference, I have attached two .net files that may be useful for troubleshooting.

 

Thank you for your assistance.

Με φιλικούς χαιρετισμούς / Kind Regards

Vasilios Karagounis

Software Engineer

Center for Research and Technology Hellas (CERTH)

Hellenic Institute of Transport (HIT)

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