Thank you Jakob. I understand the 'no-internal-links' option might reduce the 
road length, but I didn't expect so big different when inserting vehicles. Is 
it due to large portion of vehicles are generated from the beginning of 
internal links?


Yes, my goal is to avoid any jam from intersection. Beacuse vehicles entering 
the internal links of the intersection might be delayed by downstream 
spillback, and block the upstream lane. I wonder, the default setting of SUMO 
should prevent vehicles entering the box, why does it still happen in 
congestion simulation?


Thank you,
Hao 

On March 19, 2020 at 12:00 AM, Jakob Erdmann <[email protected]> wrote:


Hello,
the sumo option --no-internal-links switches to a model where the lanes within 
intersections are no longer used. This reduces the total road space of the 
simulation and can thereby affect insertion (vehicle insertion can be 
delayed/fail due to lack of road space).
If you set the netconvert option --no-internal-links when building the network, then the 
length of "normal" (non-intersection) edges is artificially increased to 
compensate for the missing road space.
Note, that some types of blockage (jam on intersections) is impossible when 
using --no-internal-links.



regards,
Jakob




Am Mi., 18. März 2020 um 15:46 Uhr schrieb Hao Zhou <[email protected]>:

Hi Sumo community,


Hope everyone is safe and healthy.
I encountered an interesting problem where vehicles cannot be inserted to the 
network if I set '--no-internal-links' to be true. Does this option suppress 
the insertion of vehicles?
My goal is to keep generating new vehicles using traci.vehicle.add to reach a 
very congested network. It can be done with internal links, but as expected we 
will see vehicles entering the intersection and lead to gridlock. When setting 
'--no-internal-links', the vehicle accumulation is significantly slower and as 
the figure shows, there seems a limit on the number of vehicles.   




Does anyone have similar experience? Thank you in advance!


Best,
Hao Zhou,
Georgia Tech
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