Hello,
the only built-in distribution you can get with <flow probability="..."
.../> is the Bernoulli Distribution with can be used to approximate the
Poisson distribution (
https://en.wikipedia.org/wiki/Binomial_distribution#Poisson_approximation).
For everything else you have to generated your own xml input of individual
vehicles or trips with pre-computed departure times that follow the desired
distribution.

regards,
Jakob

Am Fr., 18. Juni 2021 um 09:58 Uhr schrieb Jie Zhu <[email protected]>:

> Hi,
>
>
> I am new to SUMO and notice from the user document that SUMO can insert
> vehicles in a equally-spaced or randomized manner. I wonder if it is
> possible to have user-defined randomness at vehicle insertion? For example,
> can I by some means regulate that the departure time between
> consecutive vehicles follows a certain distribution (e.g., Poisson)?
>
>
> Thank you!
>
> Jie
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