With "override" I meant "set an upper bound". See the formula now added at https://sumo.dlr.de/docs/Simulation/VehicleSpeed.html#edgelane_speed_and_speedfactor
Am Do., 20. Aug. 2020 um 19:37 Uhr schrieb Bae, Jong In <[email protected]>: > > 1. It seems like the max speed is defined as 'the maximum speed > desired by driver under any circumstances' according to > https://sumo.dlr.de/docs/Simulation/VehicleSpeed.html. > Then is desired speed = maxSpeed? Also, is the desired speed > calculated by the multiplier factor (from the distribution in which speed > factor is the mean and speed dev is the standard deviation) * lane (or > edge) speed limit? > > 2. Doesn't the formula you provided (speedFactor * speedLimit) > describe how 'desired speed' is calculated? If maxSpeed can be thought as > the desired speed (assuming that my thoughts on #1 is correct), what does > it mean that maxSpeed can override the desired speed? > 1. A follow up question is the SUMO vehicle definition says that > the default value of maxSpeed is 55.55 m/s. If maxSpeed can override > speedFactor > * speedLimit, wouldn't the vehicle always drive at 55.55m/s? > > > Sorry if my questions are unclear. Please let me know if there is anything > I can further clarify. > Thank you very much for your replies. > > > ------------------------------ > *From:* [email protected] <[email protected]> on > behalf of Jakob Erdmann <[email protected]> > *Sent:* Thursday, August 20, 2020 2:48 AM > *To:* Sumo project User discussions <[email protected]> > *Subject:* Re: [sumo-user] Understanding SpeedDev. > > 1) the distribution assigns a factor to each vehicle by default this is in > the range [0.2, 2]. This is multiplied with the speedLimit to compute the > desired speed on a given road > 2) maxSpeed can override the value of speedFactor * speedLimit > > If you already read the page > https://sumo.dlr.de/docs/Simulation/VehicleSpeed.html, feel free to point > out amendments that would make the explanations there more obvious. > > Am Do., 20. Aug. 2020 um 05:15 Uhr schrieb Bae, Jong In <[email protected] > >: > > 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:* [email protected] <[email protected]> on > behalf of Jakob Erdmann <[email protected]> > *Sent:* Monday, August 17, 2020 2:16 AM > *To:* Sumo project User discussions <[email protected]> > *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. > ( > https://upload.wikimedia.org/wikipedia/commons/8/8c/Standard_deviation_diagram.svg > ) > 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 <[email protected] > >: > > 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, > _______________________________________________ > sumo-user mailing list > [email protected] > To unsubscribe from this list, visit > https://www.eclipse.org/mailman/listinfo/sumo-user > > _______________________________________________ > sumo-user mailing list > [email protected] > To unsubscribe from this list, visit > https://www.eclipse.org/mailman/listinfo/sumo-user > > _______________________________________________ > sumo-user mailing list > [email protected] > To unsubscribe from this list, visit > https://www.eclipse.org/mailman/listinfo/sumo-user >
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