Hi Jakob, Just to confirm that this fix does seem to have fixed the problem. Many thanks.
On Thu, 10 Feb 2022 at 13:24, Jakob Erdmann <namdre.s...@gmail.com> wrote: > 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 >> > _______________________________________________ > 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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