Hello, you can download a test case that shows breakdown of flow at https://sumo.dlr.de/extractTest.php?path=sumo/cf_model/fundamental/krauss_t0.9_s1 The test case collects traffic data which can be used to plot a fundamental diagram with sumo/tools/visualization/plotXMLAttributes.py edgedata.xml -i id -x density -y left -s --scatterplot --yfactor 60 --ylabel vehs/hour
It's pretty hard to observe spontaneous breakdown on a straight road because the disturbances travel upstream and take a while to develop into a full jam. For this reason the test uses 20km of road. regards, Jakob Am Fr., 1. Apr. 2022 um 14:02 Uhr schrieb dvir n <[email protected]>: > Hello, > > I am trying to generate a realistic scene of a traffic break-down which is > followed by many dynamic moving shokwaves in various lengths and speeds. > In order to reach that road condition, I have modeled a simple 2 lane 4 km > long straight road and inserted a high traffic flow (more than 2000 > veh/hr/lane). However, no real serious shokwaves were observed. > I was trying different car-following models which SUMO offers and edited > their and the general Vtype attributes values. I have even decreased > simulation time-step to 0.001 sec but still didn't succeed although high > traffic values were observed (for example: Qmax = 2250veh/hr/lane, Km = > 24veh/km, Vm = 94km/hr ). > > I will be glad to hear any suggestions for solving this problem and > observing shockwaves which are caused just by the high density of vehicles > in the road and not by an artificial interference such as adding ramp-in / > generating a bottleneck / changing one car's speed or the road's shape / > inserting non realistic Vtype's attribute values etc. > > Sincerely, > > Dvir > > > > > > > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> > Virus-free. > www.avast.com > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> > <#m_5031052270448512508_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > _______________________________________________ > sumo-user mailing list > [email protected] > To unsubscribe from this list, visit > https://www.eclipse.org/mailman/listinfo/sumo-user >
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