calibration using wiedemann

[hadiyawani64-cmd]

I am trying to do calibration of my model which is mixed traffic flow(Indian Conditions) using Wiedemann, i want to know if this is same W74 of Vissim, as the parameters in both are different, Also, what are the parameters that I should change to match my Vissim W74 for same model.

[namdre]

The model in SUMO is subtly different from the W74 model for historical reasons. You cannot transfer the parameters directly. The relationship is:

• standstill distance AX = 1 + vehicle length + 2* security
• following distance BX = (1 + 7 * security) * sqrt(speed)
• multiplicative part CX = 25*(1 + security + estimation)

for reference, see https://github.com/eclipse-sumo/sumo/blob/main/src/microsim/cfmodels/MSCFModel_Wiedemann.cpp

[namdre]

The Implementation of Wiedemann in SUMO is based on this publication: https://sumo.dlr.de/pdf/1995_Stebens_Traffic_Simulation_with_the_Wiedemann_Model.pdf

[hadiyawani64-cmd]

Okay, Thank you

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On Mon, 15 Jun 2026 at 12:09, Jakob Erdmann ***@***.***> wrote: *namdre* left a comment (eclipse-sumo/sumo#18093) <#18093 (comment)> The Implementation of Wiedemann in SUMO is based on this publication: https://sumo.dlr.de/pdf/1995_Stebens_Traffic_Simulation_with_the_Wiedemann_Model.pdf — Reply to this email directly, view it on GitHub <#18093?email_source=notifications&email_token=B52RCI2IN2CUA6ENTTRKHJL476K25A5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTINZQGUZDENBQHEZKM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KYZTPN52GK4S7MNWGSY3L#issuecomment-4705224092>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/B52RCIZQGQB7ZOQ554KL4X3476K25AVCNFSNUABFKJSXA33TNF2G64TZHMYTAOBVHEZDGMBXHNEXG43VMU5TINRTHEZTIMRQGA3KC5QC> . Triage notifications, keep track of coding agent tasks and review pull requests on the go with GitHub Mobile for iOS <https://github.com/notifications/mobile/ios/B52RCI22RETXPHYVLU7X54T476K25A5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTINZQGUZDENBQHEZKM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KUZTPN52GK4S7NFXXG> and Android <https://github.com/notifications/mobile/android/B52RCI72CBYK26MARTHWLLL476K25A5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTINZQGUZDENBQHEZKM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2K4ZTPN52GK4S7MFXGI4TPNFSA>. Download it today! You are receiving this because you authored the thread.Message ID: ***@***.***>