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Re: [sumo-user] Default of departLane
I can confirm that the departLane has a major impact on possible flow and that "best" is better suited for multi-lane roads than "first".
See https://sumo.dlr.de/docs/Simulation/RoadCapacity.html#insertion_capacity_on_a_2-lane_road
However, when modelling vehicles that start from their home address, "first" is a better default.
If you are using od2trips, you can set option --default.departlane to set a value that is most suitable for your use case. Many other tools such as randomTrips.py and routeSampler.py also provide an option to set the default departlane.

regards,
Jakob


Am Mo., 7. Juli 2025 um 17:18 Uhr schrieb Ni Ying-Chuan via sumo-user <sumo-user@xxxxxxxxxxx>:

Dear SUMO team,

 

I am wondering if it would be better to set the default of departLane to “best” instead of “first” for microsimulation.

In a multi-lane condition, if the default is “first”, this means that the maximum flow at the entry can never actually exceed the capacity of one lane. At least this is what I’ve observed. Could you confirm this?

It is going to cause trouble when expecting the inflow demand to be larger than the capacity of one-lane. For OD calibration, this can be problematic.

 

Thanks in advance for answering.

 

Kind regards,

Ying-Chuan Ni

 

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