Many thanks, Jakob. On Fri, 25 Feb 2022 at 12:13, Jakob Erdmann <[email protected]> wrote:
> If your flow is dense, than the speed will be dominated by the slowest > vehicles. To see a higher variety of speeds, reduce density. > > Am Do., 24. Feb. 2022 um 14:53 Uhr schrieb Sumbal Malik < > [email protected]>: > >> Dear Jakob >> >> Thank you very much for your detailed response, I will look into these >> links. >> >> How can I generate the flow of vehicles with different speeds? I even >> used the sigma="1" and speedFactor but still do not see any difference. >> >> <routes> >> >> <vType id="type1" vClass="passenger" color="red" sigma="1" >> speedDev="0.3"/> >> <vType id="type2" vClass="passenger" color="green" sigma="1" >> speedFactor="1.2"/> >> >> <flow id="f1" type="type1" vehsPerHour="2000" from="E1" to="E1" >> departLane="0" departSpeed="avg" begin="0" end="3600"/> >> <flow id="f2" type="type2" vehsPerHour="4000" from="E1" to="E1" >> departLane="best" departSpeed="avg" begin="0" end="3600"/> >> >> </routes> >> >> I also looked into this link: >> https://sumo.dlr.de/docs/Definition_of_Vehicles%2C_Vehicle_Types%2C_and_Routes.html#speed_distributions >> >> Thank you >> >> >> >> >> On Thu, 24 Feb 2022 at 17:25, Jakob Erdmann <[email protected]> >> wrote: >> >>> 1. you are simulating a high level of traffic with an (almost) constant >>> insertion flow on a short road segment. There are actually a few datapoints >>> in the left side of the plot from the time where the road starts to fill. >>> Afterwards the traffic stays dense. Note, that your simulation has extreme >>> insertion backlog (the requested flow is higher than the road capacity) and >>> this slows down your simulation (see >>> https://sumo.dlr.de/docs/Simulation/VehicleInsertion.html#delayed_departure >>> ) >>> >>> 2. vehicle insertion in SUMO generally cannot create a breakdown in flow >>> on a single road. For this you need some kind of obstruction downstream of >>> the insertion point (i.e. from a junction). Hence, in your simulation the >>> density never increases to the point where speed is lowered significantly. >>> >>> 3. your simulation shows saturation flows (minimum headway for the given >>> speed) over a narrow range of speeds. In this speed range the flow is >>> mainly determined by the (constant) time headway of the simulation and >>> hence remains unaffected. For more math on this, see >>> https://sumo.dlr.de/docs/Simulation/RoadCapacity.html >>> >>> 4. The gaps on the road are high because their speed is high. The speed >>> remains high because vehicles can drive off without obstruction after >>> insertion. >>> >>> For a discussion on generating all traffic density states, see >>> https://sumo.dlr.de/docs/Tutorials/FundamentalDiagram.html >>> >>> regards, >>> Jakob >>> >>> >>> Am Di., 22. Feb. 2022 um 22:49 Uhr schrieb Sumbal Malik < >>> [email protected]>: >>> >>>> I also run the simulation with a short length of edge 500m with the >>>> same repeated vehicle flows but still, the graphs are not generating >>>> correctly as they should be. I also observed that the speed is not changing >>>> and there is a lot of gaps between the vehicles on the road. >>>> >>>> On Tue, 22 Feb 2022 at 14:29, Sumbal Malik <[email protected]> >>>> wrote: >>>> >>>>> Dear Jakob >>>>> >>>>> Apologies to bother you again. >>>>> >>>>> As per your suggestions, I generated the attached graphs using the >>>>> below commands: >>>>> >>>>> 1) Occupancy vs Time Loss -- plotXMLAttributes.py edge_data.xml -i id >>>>> -x occupancy -y timeLoss -s --scatterplot --xlabel Occupancy(%) --ylabel >>>>> TimeLoss(s) >>>>> >>>>> 2) Density vs Speed -- plotXMLAttributes.py edge_data.xml -i id -x >>>>> density -y speed --yfactor 3.6 -s --scatterplot --xlabel density --ylabel >>>>> km/h" >>>>> >>>>> 3) Density vs Arrived -- plotXMLAttributes.py edge_data.xml -i id -x >>>>> density -y arrived --yfactor 60 -s --scatterplot --xlabel density --ylabel >>>>> VehPerHour >>>>> >>>>> I would be grateful if could clear the following confusions: >>>>> >>>>> 1. Why no data is plotted on the left side of all graphs. >>>>> 2. In Graph_2: why the speed is high even though the density is high >>>>> ... should not the speed be slow when the density is high? If we have high >>>>> density, the vehicles will move slowly. >>>>> 3. In Graph_3: similarly if the density is high then the number of >>>>> Vehperhour leaving the edge should be less but in the attached graph it is >>>>> opposite. >>>>> >>>>> Please find the attached configuration files and graphs >>>>> >>>>> Please guide me where I am making mistakes. >>>>> >>>>> Thank you >>>>> >>>>> On Mon, 21 Feb 2022 at 17:48, Jakob Erdmann <[email protected]> >>>>> wrote: >>>>> >>>>>> In case that the edge in question is not a transit edge but the >>>>>> destination edge, use 'arrived' instead of 'left'. >>>>>> >>>>>> Am Mo., 21. Feb. 2022 um 14:42 Uhr schrieb Sumbal Malik < >>>>>> [email protected]>: >>>>>> >>>>>>> Thank you very much for your reply. >>>>>>> >>>>>>> I generated the edge data with <edgeData id="dump_60" freq="60" >>>>>>> file="edge_data.xml" excludeEmpty="true"/>. >>>>>>> But the output of the edge data shows left vehicles "0" for each >>>>>>> time step. >>>>>>> >>>>>>> <interval begin="0.00" end="60.00" id="dump_15"> >>>>>>> <edge id="E1" sampledSeconds="1422.00" traveltime="80.92" >>>>>>> overlapTraveltime="81.36" >>>>>>> density="23.70" laneDensity="11.85" occupancy="6.38" >>>>>>> waitingTime="0.00" timeLoss="140.73" >>>>>>> speed="12.36" speedRelative="0.89" departed="48" arrived="0" >>>>>>> entered="0" left="0" laneChangedFrom="6" laneChangedTo="6"/> >>>>>>> </interval> >>>>>>> >>>>>>> Please find the attached configuration files. >>>>>>> >>>>>>> >>>>>>> >>>>>>> Thank you >>>>>>> >>>>>>> >>>>>>> On Mon, 21 Feb 2022 at 16:38, Jakob Erdmann <[email protected]> >>>>>>> wrote: >>>>>>> >>>>>>>> 1. you cannot do this with fcd-output directly since you need an >>>>>>>> intermediate processing step to compute average speeds (fcd has no >>>>>>>> aggregation). You could plot edgeData 'speed' vs 'left' for this >>>>>>>> 2. as above. You need to program your own aggregation for this. >>>>>>>> 3. edgeData 'left' vs 'density' >>>>>>>> >>>>>>>> Am Sa., 19. Feb. 2022 um 09:45 Uhr schrieb Sumbal Malik < >>>>>>>> [email protected]>: >>>>>>>> >>>>>>>>> Dear All >>>>>>>>> >>>>>>>>> I'm struggling to plot some graphs from the attached files. >>>>>>>>> >>>>>>>>> I would be thankful if you could share the script/commands to >>>>>>>>> generate the graphs: >>>>>>>>> >>>>>>>>> 1. How can I plot a graph of average speed versus vehicles per >>>>>>>>> hour using FCD output. >>>>>>>>> >>>>>>>>> 2. How to plot a graph of the average leader gap versus vehicles >>>>>>>>> per hour using FCD output. >>>>>>>>> >>>>>>>>> 3. How to calculate the number of vehicles per time that pass >>>>>>>>> through a given point and plot them versus density? >>>>>>>>> >>>>>>>>> Thank you in advance. >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> _______________________________________________ >>>>>>>>> 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 >>>>>>> >>>>>> _______________________________________________ >>>>>> 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 >>> >> _______________________________________________ >> 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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