Sorry, I forgot to mention that the value of sigma=0.0 also has a major effect. The default value of sigma is 0.5 which causes small deviations from the optimal speed. With your sigma value of 0 you get "perfect" car-following which also raises the flow.
Am Mo., 14. Sept. 2020 um 18:54 Uhr schrieb Bae, Jong In <jba...@gatech.edu >: > Jakob, > > I must be doing something wrong. I changed the simulation step length to > 1s and re-ran the experiment. > The maximum hourly vehicle count was still around 1,040 vehicles/hr. > Did you still get the flow ~880 when you ran a test with my scenario? > > I wonder if I am using a different methodology or setting than you are. > I think it'd be better to first get the same result as you and then start > exploring the effects of using different settings. > > Thank you so much for your help! > ------------------------------ > *From:* sumo-user-boun...@eclipse.org <sumo-user-boun...@eclipse.org> on > behalf of Jakob Erdmann <namdre.s...@gmail.com> > *Sent:* Monday, September 14, 2020 10:01 AM > *To:* Sumo project User discussions <sumo-user@eclipse.org> > *Subject:* Re: [sumo-user] Measuring Capacity of a Lane > > Hello, > the difference in observed flows comes from the different step-lengths of > the simulation. An explanation is given at > https://sumo.dlr.de/docs/Car-Following-Models.html#actionsteplength > Basically, the effect on reaction time affects the flow when starting a > queue of stopped vehicles. > > regards, > Jakob > > > > Am Fr., 11. Sept. 2020 um 18:14 Uhr schrieb Bae, Jong In < > jba...@gatech.edu>: > > Jakob, > > Thank you for your reply and taking a look at my scenario. > Please see the attached zip file for the scenario files. > I've also attached the results I got from the e3Detectors where I summed > up the 'interval_vehicleSum' (the last 3600s) for the capacity. > > Thank you, > > > > ------------------------------ > *From:* sumo-user-boun...@eclipse.org <sumo-user-boun...@eclipse.org> on > behalf of Jakob Erdmann <namdre.s...@gmail.com> > *Sent:* Friday, September 11, 2020 3:34 AM > *To:* Sumo project User discussions <sumo-user@eclipse.org> > *Subject:* Re: [sumo-user] Measuring Capacity of a Lane > > Hello, > my own test shows a flow of ~880. > If the road after the signal continues at 14m/s, flow drops to 780 > If there is a turn after the signal, flow drops even further depending on > turning radius. > Can you share your scenario? > > regards, > Jakob > > > Am Do., 10. Sept. 2020 um 19:23 Uhr schrieb Bae, Jong In < > jba...@gatech.edu>: > > Hello, > > I ran a simple experiment to measure the capacity of a one-lane signalized > exit ramp that is 1500 feet long. > The result came out a lot higher than expected. The capacity came out to > be roughly 1,100 veh/hr. (I was expecting to see around 750~800 veh/hr > since the ramp is signalized). > Is this a typical capacity value in SUMO? I've also included a brief > scenario settings and methodology below. > > The goal was to measure the capacity of a one-lane exit ramp which is 1500 > feet long. > A signal (G:50, R:70) is placed at the end of the exit ramp. A single > vehicle type was used with minGap=2.2 and tau=1. > The speed on the exit ramp is 24.59m/s (approximately 55mph). A few > iterations were done with various traffic flows. > Each iteration was run for 4500 timesteps where the vehicle count of the > last 3600 timesteps was collected (first 900 timesteps were a warm-up > period). > e3detectors were placed right after the signal and 'vehicleSum' was used > to get the vehicle count for the 3600 timesteps. > The maximum count out of all iterations was determined to be the capacity. > > Any help would be greatly appreciated. > > Thank you, > > > > _______________________________________________ > 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 > > _______________________________________________ > 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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