Ok, what i want is to create cars which havn't predefined flows or trips, because i want to make some cars circulating randomely on a closed network.
So i have a closed network and the only way i found to make something kinda similar to what i want is to generate a lot of differents trips with the script "randomTrips.py" in the SUMO/tools ...
But in fact this isn't a chaotic simulation because it's reproducible and that's not what i want ! I really want that each time an agent comes across an intersection he makes a random choice of where he'll go.
So if someone got an idea I apreciate