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Re: [sumo-user] '--no-internal-links' suppress the insertion of new vehicles?

Hi Jakob, thanka for your answer. Later on I found the solution is to set 'depart speed' 'depart pos' and 'depart lane'.

Now I am able to generate high density with '--no-internal-links'. However, it is still puzzling to me why gridlock still exsit, and more specifically, I noticed some vehicle can be half on origin lane, and maybe half on the next lane. As the figure shows, the vehicle is already on southbound lane D6D5_0, but its origin eastbound lane E6D6 is still blocked. I conjecture that the vehicle is still half located on its origin lane. Do you have any ideas to fix that?

I know a manual method, which is to check downstream availability for every lead vehicle using traci in every simulation step. If the availability is not enough, manully pause the vehicle by setting its speed to zero. I think the method is not efficient. Hope you have a better solution. 


20200319_171506000_iOS.jpg
Thank you and take care,
Hao

On March 19, 2020 at 12:00 AM, Jakob Erdmann <namdre.sumo@xxxxxxxxx> 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 <zhouhaoseu@xxxxxxxxxx>:
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.   

PastedImage-1.png

Does anyone have similar experience? Thank you in advance!

Best,
Hao Zhou,
Georgia Tech
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