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[sumo-user] The mesoscopic model
  • From: "Ni Ying-Chuan" <ying-chuan.ni@xxxxxxxxxxxxxxxx>
  • Date: Wed, 2 Apr 2025 08:27:22 +0000
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  • Thread-topic: The mesoscopic model

Dear SUMO team,

 

I would like to test the accuracy of the mesoscopic model in SUMO, which is based on the Eissfeldt's dissertation (2004).

The model describes that when there is a spillback (the downstream edge is completely occupied), the headway from upstream edge to the downstream edge is the time required for a space to travel upstream, which is of course theoretically correct.

However, in the case I implemented, it seems that the headway is immediately updated in the following time steps when a vehicle leaves the downstream link (the link becomes free because of the smaller number of vehicles), while the void space hasn't yet arrived at the upstream end actually.

The resulting link density evolutions are hence very different from the microsimulation ground-truth. The congestion ends earlier because spillback is not properly considered.

Attached are the case study of a simple urban corridor.

 

Could you let me know if this is a problem that was overlooked? Or is there any parameter I need to change to make the meso-simulation better?

If it indeed is a problem, I can share a solution. Please feel free to contact me via the email below to discuss.

Thank you very much. I look forward to your reply.

 

Kind regards,

Ying-Chuan Ni

 

--------------------------------

Email: ying-chuan.ni@xxxxxxxxxxxxxxxx

Traffic Engineering Group (SVT)

Institute for Transport Planning and Systems (IVT)

ETH Zurich

 

 

Attachment: SUMO_meso_micro_validation.zip
Description: SUMO_meso_micro_validation.zip

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