Re: [sumo-user] The benefit of using sub-second StepLength

[Jakob Erdmann <namdre.sumo@xxxxxxxxx>]

The main reason for setting a lower step-length is to increase the time resolution of the simulation outputs.

For modelling large reaction times I'd set the step-length to 1 and the action-step-length to a higher value.

However, I would expect all kinds of unrealistic results from reaction times around 2. (Either vehicles keeping very large headways if you also increase the 'desired time headway' parameter tau or collisions if you leave it at it's default of 1).

Also, lane-changing may be problematic because speed adjustments to create the necessary gaps take place at the action-step-length and this increase the time for successful gap creation.

Am Mi., 26. Juni 2019 um 17:57 Uhr schrieb Mohsen Rahmati <mohsen.eng74@xxxxxxxxx>:

Hello,

I would be thankful if any one could tell me what are the benefits of using sub-second StepLength?

as stated in SUMO user documentation, for a realictic behavior of drivers reaction time, it is suggested that to use higher value for actionStepLength.

"By default, the action step length is equal to the simulation step length which works well for the default step length of 1s. When performing sub-second simulation by setting a lower step-length value, it may be useful to maintain a higher action step length in order to model reaction times and also in order to reduce computational demand and thus speed up the simulation." ref:wiki/Car-Following-Models

how should i configure StepLength and actionStepLength in order to get an average of 2 second reaction time? 

With Best Regards,

Mohsen Rahmati

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