setProgram always affects  single traffic light controller. If that traffic
light is a joined controller then all it's  junctions will all be affected.
Placing multiple programs in a single file does not make them "joined".
See
https://sumo.dlr.de/docs/Simulation/Traffic_Lights.html#controlling_multiple_junctions_with_the_same_controller
for the meaning of "joined controller".

Am Fr., 9. Apr. 2021 um 18:33 Uhr schrieb Shah Sultan <
syedshahsul...@gmail.com>:

> tsl.xml <
> http://sumo-user-mailing-list.90755.n8.nabble.com/file/t507/tsl.xml>
>
>
> Dear all
>
> I am having a query regarding the additional file for modifying the
> existing
> TLS program.
>
> I have four different junctions which I have included in a single
> additional
> file. The program ID is 1 and the tl junction IDs are *2273469505*,
> *454336319*, *268032054*, and *1886728151*. The additional file is
> attached.
>
> The question is if I set *traci.trafficlight.setProgram('1886728151',1)*
> the
> program for the mentioned junction ID will be modified or all the junctions
> mentioned in the additional file will be modified?
>
>
>
> --
> Sent from: http://sumo-user-mailing-list.90755.n8.nabble.com/
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