[sumo-user] Understanding Sigma

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[sumo-user] Understanding Sigma

Bae, Jong In
Hello,

I was wondering how Sigma affects the vehicle speed.
The description says 'the driver imperfection'. Does this refer to the speed variation from the desired speed?
Does it act as another multiplier to the speed? If so, how does it interact with other speed parameters (SpeedFactor, speedDev, etc.)?

Thank you,

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Re: [sumo-user] Understanding Sigma

Maria.Armellini

Hi,

 

Here is a previous answer from Jakob on this subject:

 

The behavior of sigma is carFollowModel dependent. In the default Krauss-model it applies uniform randomDeceleration from [0, sigma * min(accel, currentSpeed)] to the speed that would otherwise be chosen due to car-following or junction-approach. Note, that there is a strong interaction with the simulation step-length parameter.

We are actively working on alternative models for driver imperfection (https://sumo.dlr.de/wiki/Driver_State)”

 

Regards,

Giuliana

 

Von: [hidden email] <[hidden email]> Im Auftrag von Bae, Jong In
Gesendet: Sonntag, 27. Dezember 2020 16:35
An: [hidden email]
Betreff: [sumo-user] Understanding Sigma

 

Hello,

 

I was wondering how Sigma affects the vehicle speed.

The description says 'the driver imperfection'. Does this refer to the speed variation from the desired speed?

Does it act as another multiplier to the speed? If so, how does it interact with other speed parameters (SpeedFactor, speedDev, etc.)?

 

Thank you,


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