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 >
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