Hi Jane,
Your approach sounds quite complicated and I am not sure if I get you points correctly. It is also not clear how steps 1 and 2 exactly interact
with each other….
You could set all the vehicles keeping the original assigned routes within the first 3600 s in the duaIterate.py so that the traffic state files
will be saved for further iterations. The duaIterate will then start to find the DUE for the vehicles departing after 3600 s. But it is not clear where/how/for what your optimization algorithm will be applied…..
Another thought is to do as follow:
1.
run sumo for the simulation for the first 3600 s and save the traffic state files
2.
apply your optimization algorithm to get the result as input(?)
3.
pause the sumo simulation and start the duaIterate.py also with the inputs from 2 (?) and the traffic state files in 1 to get the final
route file
4.
continue to run sumo and use traci and the routes from 3 to replace the routes of the vehicles in the network.
In this way, you need to put all these steps in a script.
Best regards,
Yun-Pang
Von: sumo-user-bounces@xxxxxxxxxxx [mailto:sumo-user-bounces@xxxxxxxxxxx]
Im Auftrag von Jane Cheung
Gesendet: Dienstag, 30. Juni 2020 03:52
An: Sumo project User discussions
Betreff: Re: [sumo-user] Problem about the DUE in simulation
Thanks for your reply!
In my case, I also want to do other optimization at 3600 s which will also change the route. In other words, there' are two steps I want to
1) First, do my specific optimization algorithm that will influence the traffic flow from 3601s-7200s,
2) then, use duaIterate.py to get the equilibrium traffic flow based on the optimized traffic time in step 1).
The problem that confused me is how could I use duaIterate.py to generate the optimized routes in step 2) during the simulation?
What I can do is to use duaIterate.py before simulation and use the last step iterated ROUTE file as the ROUTE file in sumo.cfg (as you reply in email )and run sumo.exe at my defined simulation start time, like 0s. I wonder
is there some methods I could do duaIterate.py( iterations = 50) at 3600s and then reload
duaIterate.py( iterations = 50) generated route file and let the simulation continue with that route?
Dear Jane,
To get an assignment result, which is reached or closed to a DUE state, you can use
duaIterate.py under the Directory “tool\assign” of your SUMO Directory. The duaIterate.py will do the traffic assignment with the DUE-objective iteratively until the defined number of iterations is reached. At each iteration, the traffic state in the previous
iteration will be used for traffic assignment.
To facilitate the whole assignment process you can also use SUMO’s rerouting options
at the same time so that simulation objects can consider the latest traffic information for mode/route choice during simulation. In order to do that you need to give the following commands in addition to the required inputs (as indicated “…” below) when running
duaIterate.py, where 1.0 means all vehicles have the rerouting devices, and 300 means the traffic information is updated every 5 mins for vehicles with rerouting device. Of course, you can adjust these values according to your need.
duaIterate.py .... sumo--device.rerouting.probability 1.0 sumo--device.rerouting.period 300
After running the duaIterate.py you can check the route travel times of the simulation
objects in the last file ‘*.alt.xml’ , which is an alternative route file generated by the duarouter at each iteration. If the time difference is larger than your threshold, you can increase the number of iterations in the duaIterate.py and re-run the script.
I hope, this helps.
Best regards,
Yun-Pang
Von:
sumo-user-bounces@xxxxxxxxxxx [mailto:sumo-user-bounces@xxxxxxxxxxx]
Im Auftrag von Jane Cheung
Gesendet: Sonntag, 28. Juni 2020 04:28
An: Sumo project User discussions
Betreff: [sumo-user] Problem about the DUE in simulation
Dear all,
Could anyone give me some suggestions on how to reroute routes for vehicles that have not finished their journeys with DUE algorithm during simulation?
After the simulation running 5min( the duration for the simulation is 20min ), I would like to refresh the routes for all vehicles moving or going to insert in my network. After
refresh routes, the traffic flow state is in DUE.
Any kind of help would be appreciated!
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