Yes. That should work (see also https://sumo.dlr.de/docs/Tutorials/FundamentalDiagram.html).
Am Mo., 22. Nov. 2021 um 23:02 Uhr schrieb François Vaudrin < [email protected]>: > Hello Jakob, > > > Thanks for the reference, that sounds very interesting to me. > > > Since there is no closed loop on a highway, I'm thinking of artificially > creating density with variable speed panels toward the end of the network. > > Does it make sense? > > Best > > *François * > > *De :* sumo-user <[email protected]> > <[email protected]> de la part de Jakob Erdmann > <[email protected]> <[email protected]> > *Envoyé :*ect User discussions <[email protected]> > <[email protected]> > *Objet :* Re: [sumo-user] Publics Roads (BPR) formula > > Hello François, > Most likely, your scenario does not reach the required traffic density. > Check for insertion-backlog in you scenario ( > https://sumo.dlr.de/docs/Simulation/VehicleInsertion.html#investigating_insertion_delay > <https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsumo.dlr.de%2Fdocs%2FSimulation%2FVehicleInsertion.html%23investigating_insertion_delay&data=04%7C01%7Cfrancois.vaudrin.1%40ulaval.ca%7Cb64fbaf2a869463e485a08d9ab69f48e%7C56778bd56a3f4bd3a26593163e4d5bfe%7C1%7C0%7C637729294883782117%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=98BEjcmXiMLu8SMOAidVZz3%2BvX8j6aTNlr4%2B%2BLTA0GU%3D&reserved=0> > ) > Feel free to post your files to enable more specific advice. > > regards, > Jakob > > Am Fr., 19. Nov. 2021 um 07:24 Uhr schrieb François Vaudrin < > [email protected]>: > > This is the BPR formula. > > Best regards > > > *François * > > ------------------------------ > *De :* François Vaudrin <[email protected]> > *Envoyé :* vendredi 19 novembre 2021 01:07 > *À :* mvaudrin <[email protected]> > *Objet :* TR: [sumo-user] Publics Roads (BPR) formula > > Info. > > > *François * > ------------------------------ > *De :* François Vaudrin <[email protected]> > *Envoyé :* vendredi 19 novembre 2021 01:06 > *À :* Sumo project User discussions <[email protected]> > *Objet :* RE: [sumo-user] Publics Roads (BPR) formula > > > Thank you for your answer Qichao, > > > You're right about the BPR formula, but that's not what we see with the > SUMO simulations. > > > The function we get is a line of the following form: > > > y = mx + b > > > Whereas the function of BPR is exponential and tends towards an asymptote. > > > T = Tff (1 + α (Q*Qpc)**β > > > > Perhaps this theory is debatable, because it dates from 1964 and the > microsimulation tools were not available at the time. > > > But maybe I am wrong or there is something that I do not understand. > > > Best > > > *François * > ------------------------------ > *De :* sumo-user <[email protected]> de la part de Qichao > Wang <[email protected]> > *Envoyé :* jeudi 18 novembre 2021 22:35 > *À :* Sumo project User discussions <[email protected]> > *Objet :* Re: [sumo-user] Publics Roads (BPR) formula > > At much lower flow rates, you should see a flat line. As you increase the > volume, you will see a point when the rate increases. When the capacity is > lower than the demand, as time goes, the travel time should keep > increasing. That basically means that there is no stable observed travel > time (i.e., not a single point on your graph). > > You don’t need to create bottlenecks to fit a highway performance > function. You can create a loop network to see the impact on having more > cars on road. > > Thanks, > Qichao > > On Thu, Nov 18, 2021 at 8:07 PM François Vaudrin < > [email protected]> wrote: > > Hello everyone, > > > Has anyone ever tested the Bureau of Public Roads (BPR) formula with SUMO? > > > This formula was developed in the 1960s by the BPR to estimate travel time > as a function of road capacity under free-flow conditions (such as on a > highway). The transport time increases exponentially depending on the > capacity of the road (see diagram in the attached file). > > > We would like to reproduce these phenomena with SUMO by gradually > increasing the traffic flow and measuring the total time to empty the > network. We then reproduced the results on a graph to check if it is > similar to that of the BPR. > > > The problem is that we are not getting an exponential function, but a > straight line (see results in the attached file) and that is not what the > BPR predicted in the 1960s. > > > Does that make sense? > > > Do we have to introduce a bottleneck (or reduce the speed) at the end of > the network to create a queue or traffic jam? > > > Thank you > > > *François * > CANADA > _______________________________________________ > sumo-user mailing list > [email protected] > To unsubscribe from this list, visit > https://www.eclipse.org/mailman/listinfo/sumo-user > <https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.eclipse.org%2Fmailman%2Flistinfo%2Fsumo-user&data=04%7C01%7Cfrancois.vaudrin.1%40ulaval.ca%7Cb64fbaf2a869463e485a08d9ab69f48e%7C56778bd56a3f4bd3a26593163e4d5bfe%7C1%7C0%7C637729294883782117%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=yFmGp2lmKDrtqS9iOaWdeY3tuzzCfnLHRS3npcrGMWU%3D&reserved=0> > > _______________________________________________ > sumo-user mailing list > [email protected] > To unsubscribe from this list, visit > https://www.eclipse.org/mailman/listinfo/sumo-user > <https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.eclipse.org%2Fmailman%2Flistinfo%2Fsumo-user&data=04%7C01%7Cfrancois.vaudrin.1%40ulaval.ca%7Cb64fbaf2a869463e485a08d9ab69f48e%7C56778bd56a3f4bd3a26593163e4d5bfe%7C1%7C0%7C637729294883792113%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=caT8cDSSHzlrhG8uIw1UdZTW%2BxkX695A9rAnidIzA5Q%3D&reserved=0> > > _______________________________________________ > sumo-user mailing list > [email protected] > To unsubscribe from this list, visit > https://www.eclipse.org/mailman/listinfo/sumo-user >
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