You can use meso to test traffic light algorithms (by setting option
--meso-junction-control) but the dynamics (in particular acceleration and
time on junction) will be much coarser.
The warning pertains to this:
https://sumo.dlr.de/docs/Simulation/Intersections.html#internal_links
For testing small to medium size scenarios of traffic light control I would
recommend micro (the default) over meso.

regards,
Jakob

Am Di., 1. Sept. 2020 um 05:59 Uhr schrieb Jane Cheung <
[email protected]>:

> Dear all,
> I have tried to use the option in my simulation.
>
>
> <Mesoscopic>
>      <mesosim  value="true"/>
>     </Mesoscopic>
>
>
>   The command window printed some information.
> There is one information printed as "vehicles will jump over junctions".
> [image: image.png]
> What does it mean?
> If I was going to use Traci to modify the program of traffic lights to
> control the traffic flow, does it mean that the user-defined program could
> not have an effect on the traffic flow?
>
> Could someone help me to explain how to deal with this problem? In other
> words, could I modify the traffic lights program during meso-simulation by
> Traci?
>
>
> Best regards,
>
> Jane Chueng
>
>
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