Thank you for the example. I did uncover a bug in the insertion code that has now been fixed (https://github.com/eclipse/sumo/issues/10137). You can download an updated version of sumo tomorrow at https://sumo.dlr.de/docs/Downloads.php#sumo_-_latest_development_version
Am Mi., 9. Feb. 2022 um 16:18 Uhr schrieb Ste Millington < stemilling...@gmail.com>: > Please find attached my config. I've tidied things up a bit and do appear > to be now getting slightly higher densities but there still seems to be a > bottleneck at densities lower than I would expect. > > I have also attached a few graph showing how the average gap, effective > flow and average speed alter as i increase the vehsPerHour parameter. The > all seem to flatline at around 6000. > > Many thanks for taking a look at this. > > > On Wed, 9 Feb 2022 at 09:54, Jakob Erdmann <namdre.s...@gmail.com> wrote: > >> The spacing of 90m is unexpected for your setup, With the above >> configuration, you should see an average spacing of roadSpeed + vehLength + >> minGap (i.e. ~20m for 13.89/ms = 50km/h road and 7.5m length+minGap). >> Depending on road speed you should be seeing 1800 - 2000 v/h/lane. >> If you use departSpeed="avg" instead of "max", capacity goes up to 2400 >> v/h/lane >> see also https://sumo.dlr.de/docs/Simulation/RoadCapacity.html >> >> Please post your (zipped) scenario files to figure out why you are not >> seeing this. >> >> However, insertion flow alone will never lead to a breakdown of the flow. >> For that you need some sort of speed disturbance downstream. >> If you set sigma="1" you will see occasional breakdowns but they will be >> short-lived (and due to a known issue with the Krauss model, this only >> works at 1s step length). >> An alternative for inducing break-down would be a variable-speed-sign >> https://sumo.dlr.de/docs/Simulation/Variable_Speed_Signs.html >> https://sumo.dlr.de/docs/Tutorials/FundamentalDiagram.html >> >> regards, >> Jakob >> >> Am Di., 8. Feb. 2022 um 17:23 Uhr schrieb Ste Millington < >> stemilling...@gmail.com>: >> >>> I'm struggling to get high flow rates in a simple model, just a straight >>> 5km stretch of 4 lane highway. >>> >>> I'm using multiple flow elements with probability set close to 1. >>> However i can't seem to get the flow rate to ever go above 4000 vehicles >>> per hour. This only gives me 1000 vehicles per hour per lane and an average >>> vehicle spacing of 90 metres. I was hoping to be able to achieve a >>> breakdown of the flow. >>> >>> I've tried tried setting step length to 0.1 and using multiple copies of >>> >>> <flow id="flow_0" type="DEFAULT_VEHTYPE" begin="0.00" departSpeed="max" >>> departPos="last" departLane="best" route="route_0" end="3600.00" >>> probability="0.9"/> >>> >>> But after a certain point nothing seems to make much difference. I'm >>> sure I'm doing something wrong or not perhaps just misunderstanding the >>> traffic dynamics somehow. >>> >>> Should I be able to ramp up the flow rate to a point where the traffic >>> flow breaks down? >>> _______________________________________________ >>> 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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