The most likely cause is that the vehicle *wants* to change lanes but is
unable to do so because of surrounding traffic.
You can see the lane change wish and blocking state in the parameter dialog
accessible by right-clicking on the vehicle.
See here for additional blinker reasons:
https://sumo.dlr.de/docs/TraCI/Vehicle_Signalling.html#computed_signals


Am Di., 10. Mai 2022 um 18:40 Uhr schrieb Ben Duprey via sumo-user <
[email protected]>:

> Hello,
>
> I am a new user of SUMO and wanted to better understand the nature of the
> yellow side-lights on vehicles.
>
> Summary
>
>    - When SUMO detects that the planned route of the vehicle requires it
>    to change a lane or turn at a junction, the yellow side marker lights will
>    be triggered. This suggests that these represent directional lights.
>    - I believe this logic is internal to SUMO.
>    - However, I have some simulations with an ego and a single traffic
>    vehicle / NPC in which the ego does not change lanes and does not turn at
>    an intersection, and still the yellow side lights are shown.
>    - I have searched some SUMO documentation but haven't found
>    information regarding these yellow side lights.
>
>
> Any information as to their operation would be appreciated.
>
>
> Thanks
> -Ben
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