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Re: [sumo-user] Question about lane change reason "urgent" and "speedGain" in SUMO
Dear Jakob and SUMO team,

Thank you for explaining the reason for the urgent lane change based on the LC2013 model and the lcSpeedGainUrgency parameter.

However, I would like to inform you that I am currently using the SL2015 lane change model, not the LC2013 model.
In my simulation, I observed that the reason="urgent" is being recorded even though I did not explicitly set lcSpeedGainUrgency in my vType.

Could you please explain how the urgent lane change reason is determined under the SL2015 model?
I am especially interested in the formulas, variables, and thresholds used in the decision-making process.

Additionally, please clarify how speedGain is calculated in the SL2015 model.
Does it follow the same logic as LC2013 (i.e., targetLaneSpeed - currentLaneSpeed), or is there any SL2015-specific adjustment or consideration?

Thank you again for your continued support.

Best regards,
Chiwoo Roh

2025년 6월 18일 (수) 오후 4:16, Jakob Erdmann via sumo-user <sumo-user@xxxxxxxxxxx>님이 작성:
Correction: The above only pertains to urgent "speedGain" changing.
Other than that: Any strategic change (required for route-following) is urgent. All other reasons are non-urgent.

Am Mi., 18. Juni 2025 um 09:14 Uhr schrieb Jakob Erdmann <namdre.sumo@xxxxxxxxx>:
Urgent lane changing is a recent and still experimental addition to the default laneChangeModel LC2013.
It can be configured with vType attribute lcSpeedGainUrgency and should almost never occur under the default settings.

especially the linked commits:

The behavior of the new attribute is still impacted by
which limits it's usefulness in the situation where it's most needed: leveling high speed differences between lanes, especially at on-ramps.

regards,
Jakob

Am Di., 17. Juni 2025 um 17:55 Uhr schrieb 노치우 via sumo-user <sumo-user@xxxxxxxxxxx>:
Dear SUMO developers and community,

I am currently researching vehicle lane-changing behavior in SUMO. I would like to understand how the "urgent" lane change reason is computed internally. Specifically, what parameters and equations are involved in this decision process?

Additionally, could you please explain the internal logic or formula used to calculate the "speedGain" reason?

I am using SUMO version 1.23.1, and I have reviewed the documentation(Attachments), but further clarification would be very helpful.

Thank you very much for your support.

Best regards,
Chiwoo Roh
--
Chiwoo Roh                                            
M.S. Student in Transportation Research Institute, Ajou University    
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