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Re: [sumo-user] Understanding SpeedDev.
  • From: "Bae, Jong In" <jbae42@xxxxxxxxxx>
  • Date: Thu, 20 Aug 2020 03:15:15 +0000
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  • Thread-topic: [sumo-user] Understanding SpeedDev.
Thank you for your explanation.

  1. So the speed determined through this distribution, is that the maxSpeed of the vehicle? For example, if the distribution assigns 29m/s to a vehicle, would that be the maxSpeed of the vehicle?
  2. If the maxSpeed is the hard limit on the speed, does that mean it can override the lane (or edge) max speed? 
Thank you,
From: sumo-user-bounces@xxxxxxxxxxx <sumo-user-bounces@xxxxxxxxxxx> on behalf of Jakob Erdmann <namdre.sumo@xxxxxxxxx>
Sent: Monday, August 17, 2020 2:16 AM
To: Sumo project User discussions <sumo-user@xxxxxxxxxxx>
Subject: Re: [sumo-user] Understanding SpeedDev.
 
the distribution of speeds will have their mean at 30m/s and will be (almost) normally distributed with a standard deviation of 0.1 * 30 = 3m/s.
This means ~68% drive between 27ms/ and 33ms but 95% will be found between 24m/s and 36m/s.
It's "almost" normal because sumo caps the normal distribution at configurable thresholds. By default 100% will drive between [0.2 * 30m/s and 2 * 30m/s] but you can also configure these thresholds.
Also, the maxSpeed of the vType is a hard limit.

Am Fr., 14. Aug. 2020 um 21:44 Uhr schrieb Bae, Jong In <jbae42@xxxxxxxxxx>:
Hello,

I'm having a trouble with understanding the explanation on how speedFactor and speed deviation work.
If I'm using the default values of speed factor (1) and speed dev (0.1), how do they affect the vehicle speed on the lane with maximum speed of 30m/s?

Does this mean that the vehicle will drive in the range between 27m/s to 33m/s (or 30m/s since the max speed is capped at 30m/s)?
And would that be because the lane-assigned speed (30m/s) is multiplied by the speed factor of 1 with deviation of 0.1? 

Thank you,
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