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 >
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