Re: [sumo-user] How to explain pedestrian frequency in a paper?
Hello Sara, I think the density is like the occupancy rate. If you consider a sidewalk 1.5 meters wide with two people walking side by side and 60 cm between each group, then there would be 1 666 pedestrians over a distance of 500 meters. 2 (500 m / 0.6 m). So 1 666 people would be the maximum occupancy rate (100%) on the sidewalk - the queue would be full. The next step is to compare the number of pedestrians on the section to this maximum number. density = number of pedestrians / maximum number of pedestrians on the edge To know how many pedestrians there are on the section, it is then necessary to know the walking speed of each pedestrian. If the walking speed is 5 km / h, it takes 360 seconds (or 6 minutes) to make a trip of 500 meters. By adding a new pedestrian every 35 seconds, there would be 10 pedestrians on the section (edge), 360 / 35. The occupancy rate in this case would be less than 1% (10 / 1 666). I am not sure that the simplest approach, but that's the way I would do it. One should also add the people waiting at the intersection, in this case the density would not be uniform. We can also consider that the crowd is more or less compressible, so that people can be closer if necessary. Hope this can help you. François PS: Maybe SUMO is already doing some of those calculations, but I do not know these functions. François Vaudrin, ing, MBA Laboratoire ERICAE Faculté des Sciences et de Génie Université Laval, CANADA De : Sara el hamdani via sumo-user [sumo-u...@lists.sourceforge.net] Envoyé : 3 janvier 2018 05:16 À : sumo-user Objet : [sumo-user] How to explain pedestrian frequency in a paper? Hello all, In my simulation setup I used the --period 35 s, what is equivalent to 100 (ped/h). In my research paper I named the value 100 (ped/h) pedestrian density. And I got this question from the reviewer: "You did not define what pedestrian density mean?". I could not explain it from the defenition of the the period from the wiki. Could anybody help me to make the value more clear? -- *Best regards* *Sara EL HAMDANI* *Phd student -Umi University.* -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ sumo-user mailing list sumo-u...@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sumo-user -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ sumo-user mailing list sumo-u...@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sumo-user ___ sumo-user mailing list sumo-user@eclipse.org To change your delivery options, retrieve your password, or unsubscribe from this list, visit https://dev.eclipse.org/mailman/listinfo/sumo-user
Re: [sumo-user] How to explain pedestrian frequency in a paper?
Hello Sara, I may have misunderstood the question. If it is only the term (100 ped/h) that you needed to define, I would not use pedestrian density but pedestrian flow. pedestrian flow = number of pedestrian / unit of time Regards François De : François Vaudrin Envoyé : 4 janvier 2018 19:33 À : Sara el hamdani; sumo-user Objet : RE:[sumo-user] How to explain pedestrian frequency in a paper? Hello Sara, I think the density is like the occupancy rate. If you consider a sidewalk 1.5 meters wide with two people walking side by side and 60 cm between each group, then there would be 1 666 pedestrians over a distance of 500 meters. 2 (500 m / 0.6 m). So 1 666 people would be the maximum occupancy rate (100%) on the sidewalk - the queue would be full. The next step is to compare the number of pedestrians on the section to this maximum number. density = number of pedestrians / maximum number of pedestrians on the edge To know how many pedestrians there are on the section, it is then necessary to know the walking speed of each pedestrian. If the walking speed is 5 km / h, it takes 360 seconds (or 6 minutes) to make a trip of 500 meters. By adding a new pedestrian every 35 seconds, there would be 10 pedestrians on the section (edge), 360 / 35. The occupancy rate in this case would be less than 1% (10 / 1 666). I am not sure that the simplest approach, but that's the way I would do it. One should also add the people waiting at the intersection, in this case the density would not be uniform. We can also consider that the crowd is more or less compressible, so that people can be closer if necessary. Hope this can help you. François PS: Maybe SUMO is already doing some of those calculations, but I do not know these functions. François Vaudrin, ing, MBA Laboratoire ERICAE Faculté des Sciences et de Génie Université Laval, CANADA De : Sara el hamdani via sumo-user [sumo-u...@lists.sourceforge.net] Envoyé : 3 janvier 2018 05:16 À : sumo-user Objet : [sumo-user] How to explain pedestrian frequency in a paper? Hello all, In my simulation setup I used the --period 35 s, what is equivalent to 100 (ped/h). In my research paper I named the value 100 (ped/h) pedestrian density. And I got this question from the reviewer: "You did not define what pedestrian density mean?". I could not explain it from the defenition of the the period from the wiki. Could anybody help me to make the value more clear? -- *Best regards* *Sara EL HAMDANI* *Phd student -Umi University.* -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ sumo-user mailing list sumo-u...@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sumo-user -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ sumo-user mailing list sumo-u...@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sumo-user ___ sumo-user mailing list sumo-user@eclipse.org To change your delivery options, retrieve your password, or unsubscribe from this list, visit https://dev.eclipse.org/mailman/listinfo/sumo-user
[sumo-user] OK... RE:tripinfo.xml file
I just found the answer in the forum. Sorry for the disturbance. Best François De : François Vaudrin Envoyé : 19 février 2018 07:26 À : sumo-u...@lists.sourceforge.net Objet : tripinfo.xml file Hello everyone, How the file tripinfo.xml can be generated at the end of a simulation with a runner.py script ? Best regards François -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ sumo-user mailing list sumo-u...@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sumo-user ___ sumo-user mailing list sumo-user@eclipse.org To change your delivery options, retrieve your password, or unsubscribe from this list, visit https://dev.eclipse.org/mailman/listinfo/sumo-user
[sumo-user] tripinfo.xml file
Hello everyone, How the file tripinfo.xml can be generated at the end of a simulation with a runner.py script ? Best regards François -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ sumo-user mailing list sumo-u...@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sumo-user ___ sumo-user mailing list sumo-user@eclipse.org To change your delivery options, retrieve your password, or unsubscribe from this list, visit https://dev.eclipse.org/mailman/listinfo/sumo-user
Re: [sumo-user] please help me
Hello Anne, You have to reference it in the configuration file (the one that ends with .sumocfg). Example: Regards François -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ sumo-user mailing list sumo-u...@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sumo-user ___ sumo-user mailing list sumo-user@eclipse.org To change your delivery options, retrieve your password, or unsubscribe from this list, visit https://dev.eclipse.org/mailman/listinfo/sumo-user
[sumo-user] Statistics on researches by SUMO
Hallo, I would like to cite statistics on the approximate number of researches or citations in connection with SUMO. This information is it available ? Thank you, François -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ sumo-user mailing list sumo-u...@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sumo-user ___ sumo-user mailing list sumo-user@eclipse.org To change your delivery options, retrieve your password, or unsubscribe from this list, visit https://dev.eclipse.org/mailman/listinfo/sumo-user
[sumo-user] AlgeriaSimulation
To the best of my knowledge, there is no consensus on the ideal model. Each simulator uses its own model for vehicle movements and virtually all of them are "car-following-models,” that is, the behaviour of each driver depends on the distance between the vehicle ahead and its speed. I think we have to consider that even if we try to reproduce the reality, it is a complex and random phenomenon, and there is always an element of judgment in the evaluation of the results. Hope that help, François Le 2018-05-25 à 22:57, HANIFI Mohamed via sumo-user a écrit : > Hi Sumo users, > i want ask you about the best Car folloqing model to use on my real > simulation highway traffic. > thank you. > -- > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > ___ > sumo-user mailing list > sumo-u...@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/sumo-user -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ sumo-user mailing list sumo-u...@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sumo-user ___ sumo-user mailing list sumo-user@eclipse.org To change your delivery options, retrieve your password, or unsubscribe from this list, visit https://dev.eclipse.org/mailman/listinfo/sumo-user
[sumo-user] QueueOutput in a additionnal file tag ?
Hello, Are there an option to tag the QueueOutput file in additionnal-file or in .sumocfg configuration file? Example for edge info: Thank you François -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ sumo-user mailing list sumo-u...@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sumo-user ___ sumo-user mailing list sumo-user@eclipse.org To change your delivery options, retrieve your password, or unsubscribe from this list, visit https://dev.eclipse.org/mailman/listinfo/sumo-user
[sumo-user] Validation of BPR Method in SUMO: Seeking Help on Replicating Asymptotic Results in Straight Road Sections
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. [cid:1cd5d769-1781-43d1-953a-107fce5f5d18] 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
Re: [sumo-user] Validation of BPR Method in SUMO: Seeking Help on Replicating Asymptotic Results in Straight Road Sections
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 Envoyé : lundi 15 janvier 2024 06:26 À : Sumo project User discussions Cc : François Vaudrin 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" An: "Sumo project User discussions" 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. [X] 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
Re: [sumo-user] Validation of BPR Method in SUMO: Seeking Help on Replicating Asymptotic Results in Straight Road Sections
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 de la part de Harald Schaefer via sumo-user Envoyé : mardi 16 janvier 2024 04:45 À : sumo-user@eclipse.org Cc : Harald Schaefer 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 <mailto:m.bartha...@t-online.de> Envoyé : lundi 15 janvier 2024 06:26 À : Sumo project User discussions <mailto:sumo-user@eclipse.org> Cc : François Vaudrin <mailto: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" <mailto:sumo-user@eclipse.org> An: "Sumo project User discussions" <mailto: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. [X] 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<mailto: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
