See this list of resources for replicating the fundamental diagram (on loops and straight roads): https://sumo.dlr.de/docs/Tutorials/FundamentalDiagram.html
Am Mi., 17. Jan. 2024 um 08:28 Uhr schrieb Mirko Barthauer via sumo-user < sumo-user@eclipse.org>: > Dear François, > > > > tkinter is not part of SUMO but is a Python module for GUI purpose. > > > > Best regards > > Mirko > > > > > > > > -----Original-Nachricht----- > > Betreff: Re: [sumo-user] Validation of BPR Method in SUMO: Seeking Help on > Replicating Asymptotic Results in Straight Road Sections > > Datum: 2024-01-17T01:34:17+0100 > > Von: "François Vaudrin via sumo-user" <sumo-user@eclipse.org> > > An: "Sumo project User discussions" <sumo-user@eclipse.org> > > > > > > > > Hallo Harald, > > > > Thank you very much for your suggestions; it seems like a very good idea > to study the phenomenon. > > I will try to see if I can deduce the BPR curve from it. > > Is the tkinter interface an option in SUMO? > > I appreciate your assistance and welcome any further insights. > > Kind regards, > > *François* > Québec Cityl, CANADA > > ------------------------------ > *De :* sumo-user <sumo-user-boun...@eclipse.org> de la part de Harald > Schaefer via sumo-user <sumo-user@eclipse.org> > *Envoyé :* mardi 16 janvier 2024 04:45 > *À :* sumo-user@eclipse.org <sumo-user@eclipse.org> > *Cc :* Harald Schaefer <fechs...@gmail.com> > *Objet :* Re: [sumo-user] Validation of BPR Method in SUMO: Seeking Help > on Replicating Asymptotic Results in Straight Road Sections > > > Bonjour François, > > > > to simulate congestions on a highway i have created a straight road of 10 > km length. > > In the beginning I'm filling in cars on 5 lanes, then merging to 3 lanes > and oberserving the traffic after 8 or 9 km. > > The UI shows views from different part of the road. An tkinter interface > allows to control the model and shows some metrics. > > > > Best regards, Harald > > > Am 15.01.24 um 18:06 schrieb François Vaudrin via sumo-user: > > Dear Mirko, > > > > Thank you for your prompt and insightful response. > > In the past, like many others, I assumed that congestion naturally occurs > when vehicles are added on a road section, but the reality is more > complicated. However, I was hoping to find an alternative approach to > replicate the phenomenon without introducing a bottleneck. > > In the past, Jakob suggested using a closed loop to replicate the > phenomenon. Is this the sole method to achieve it? But I understand that it > may not be possible otherwise. > > The preference for a straight road is to enhance conference presentation > clarity, as a bottleneck or loop could be challenging for the audience. > > I appreciate your assistance and welcome any further insights. > > Kind regards, > > François > > Québec city , CANADA > ------------------------------ > *De :* Mirko Barthauer <m.bartha...@t-online.de> <m.bartha...@t-online.de> > *Envoyé :* lundi 15 janvier 2024 06:26 > *À :* Sumo project User discussions <sumo-user@eclipse.org> > <sumo-user@eclipse.org> > *Cc :* François Vaudrin <francois.vaudri...@ulaval.ca> > <francois.vaudri...@ulaval.ca> > *Objet :* AW: [sumo-user] Validation of BPR Method in SUMO: Seeking Help > on Replicating Asymptotic Results in Straight Road Sections > > > Dear François, > > > > as you already noted, travel times on inflow edges depend a lot on the > insertion rules and the used car-following settings. The next vehicle to be > inserted needs some space (vehicle length and distance to leader) and only > one vehicle per time step and lane can enter the network. To some extent, > your question is similar to "how to replicate the fundamental diagram in > sumo" (especially the saturated part). You need some way to increase the > vehicle density which will lead to longer travel times. > > > > Either create an artificial bottleneck or let vehicles circulate in the > network for longer and keep some distance from inflow places when measuring > the travel time. > > > > Best regards > > Mirko > > > > > > > > -----Original-Nachricht----- > > Betreff: [sumo-user] Validation of BPR Method in SUMO: Seeking Help on > Replicating Asymptotic Results in Straight Road Sections > > Datum: 2024-01-15T08:29:15+0100 > > Von: "François Vaudrin via sumo-user" <sumo-user@eclipse.org> > <sumo-user@eclipse.org> > > An: "Sumo project User discussions" <sumo-user@eclipse.org> > <sumo-user@eclipse.org> > > > > > > > > Hello, > > I'm seeking assistance in validating the BPR method using SUMO to express > travel time based on road capacity. The Bureau of Public Roads (BPR) > formula is commonly used to model travel time on a road as a function of > its capacity: After reaching a certain flow threshold, travel time > increases exponentially until reaching the ultimate capacity of the road. > > > > where: > > - T is the travel time on the road, > - Tff is the initial travel time, > - q is the flow of traffic (number of vehicles per unit time), > - qpc is the capacity of the road (maximum number of vehicles the road > can accommodate per unit time), > - α and β are adjustable parameters. > > Despite increasing the flow of vehicles in a network with SUMO, Vehicles > are being pushed backward before entering the network, possibly due to a > required distance (likely related to the car-following model), but the > results are not the same than BPR. The Time Tff appears to be a straight > line rather than an asymptotic curve. > > Appreciating any insights or suggestions to obtain similar results of BPR? > > > > Wishing a fantastic year ahead to the SUMO teams and contributors! > > > *François Vaudrin* > semaphor.ai > Québec city, Canada > > > > > > _______________________________________________ sumo-user mailing list > sumo-user@eclipse.org To unsubscribe from this list, visit > https://www.eclipse.org/mailman/listinfo/sumo-user > > > _______________________________________________ > sumo-user mailing list > sumo-user@eclipse.org > To unsubscribe from this list, visit > https://www.eclipse.org/mailman/listinfo/sumo-user >
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