Thank you, Jakob, for the fast reply. That is very likely the reason. I only 
set a value for "probability", "begin", "departLane" and "departSpeed". I 
didn't include "end", so maybe there is a default value for "end" that caused 
the flow to stop. I couldn't find the default values in the current 
documentation

http://sumo.dlr.de/wiki/Definition_of_Vehicles,_Vehicle_Types,_and_Routes#Repeated_vehicles_.28Flows.29

Also, is there a way to set 'infinity' as the "end", so the flow never stops as 
long as the simulation is running?

________________________________
From: sumo-user-boun...@eclipse.org <sumo-user-boun...@eclipse.org> on behalf 
of Jakob Erdmann <namdre.s...@googlemail.com>
Sent: Friday, February 23, 2018 3:30:23 PM
To: Sumo project User discussions
Subject: Re: [sumo-user] Traffic flow disappears after some time

Hello,
<flows> have a fixed number of vehicles usually configured by setting and 'end' 
value along with another value describing flow rate (number, probability, 
vehsPerHour).
Possibly, your flow has just run out which could be prevented by changing its 
parameters.
regards,
Jakob

2018-02-23 23:43 GMT+01:00 Jiachen Yang 
<jiachen_y...@honda-ri.com<mailto:jiachen_y...@honda-ri.com>>:

Hi all,


Has anyone encountered a situation where all the defined flows in a .rou.xml 
file have disappeared? In other words, the entire road network becomes empty 
and vehicles are no longer departing. Vehicles that my code add and remove 
using TraCI are still working fine, but the SUMO-controlled traffic have all 
disappeared. The entire simulator seems to be running as normal, just without 
any SUMO-controlled vehicles.


I'm using all the default sumo settings listed here 
(http://sumo.dlr.de/wiki/SUMO), except:

--lateral-resolution 0.8

--collision.action warn

--no-step-log True

--no-warnings True


I haven't set any limit on the total number of cars allowed, and it doesn't 
seem like any default setting is the cause. Does anyone have ideas?


Thanks,

Jiachen




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