Hey Jakob, I tried the following simple test but it failed, I don't see why it 
happens.


veh_id = 0
route_ID = str(["E3D3","D3C3",])
traci.vehicle.add(str(veh_id),route_ID)


File "/home/hao/sumo/tools/traci/connection.py", line 105, in _sendExact
raise TraCIException(err, prefix[1], _RESULTS[prefix[2]])
traci.exceptions.TraCIException: Invalid route '['E3D3', 'D3C3']' for vehicle 
'0'.



Could you help explain? 


Thank you,
Hao

On November 19, 2019 at 1:55 PM, Jakob Erdmann <[email protected]> wrote:


Hello,
you can call traci.vehicle.add repeatedly with the same routeID. just make sure 
to use a new vehicleID every time.
Alternatively, you could call sumo with option --scale to easily scale the 
amount of traffic up or down.


regards,
Jakob



Am Mo., 18. Nov. 2019 um 22:19 Uhr schrieb Hao Zhou <[email protected]>:

Hi all,


I want to keep generating vehicles until the network reaches a certain density 
level. I know sumo has the option to give a limit on the number of vehicles, 
which is one of the options. But do there exist better approaches? 
I want to do multiple experiments with different density levels, so it would be 
best if I can do it in a loop with traCI.  
I tried traci.vehicle.add, and found an old question says that route id cannot 
be repeated. 
In a word, how can I use traci to generate flow until we reach our desired 
density?


Thank you in advance,
Hao
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