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 >
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