Thanks heaps! On Thu, Aug 30, 2018 at 4:47 PM Jakob Erdmann <[email protected]> wrote:
> Hello, > This is an artefact of the simulation step-length (vehicles can only be > inserted at full seconds and this implies a narrow choice of headways when > inserting at a fixed position. (There is actually an open issue that would > fix this https://github.com/eclipse/sumo/issues/4277) > - One workaround is the insert the vehicles with the attribute > departPos="last" and departSpeed="x" where x is tuned to achieve the > desired space headway based on the car-following parameters. However, this > always results a fixed time headway according to the vehicle types tau > parameter. > - Another workaround is to lower the simulation step-length somewhat > - A third approach would be to generate the vehicles individually with a > script and define the desired departPos for each one > > regards, > Jakob > > 2018-08-30 5:41 GMT+02:00 Alan Dee <[email protected]>: > >> Hello, >> >> I have needed an equally spaced vehicle flow. As per the documentation >> <http://sumo.dlr.de/wiki/Definition_of_Vehicles,_Vehicle_Types,_and_Routes#Repeated_vehicles_.28Flows.29> >> , >> vehicles should be equally spaced unless someone randomizes the flow. I >> didn't randomize the flow, but I am experiencing that the vehicles do not >> have the same headway. >> >> Here is my rou.xml file entry, and I set sigma = 0 as well. >> >> <flow id = "f1" color="1,1,1" begin = "0" type="Car" vehsPerHour="1500" >> number="100" route="route0" departSpeed="13.9"> </flow> >> >> I am seeing majority of the vehicles have a headway around 27m and some >> other vehicles around 40m. There is a pattern. The first 2 vehicles of >> every 5 vehicles travel together (with 27m heading), and other other 3 >> travel together (with 27m heading) but with 40m gap between 3rd and the >> 2nd (e.g. V represents a vehicle >> V**V**V*****V**V*****V**V**V*****V**V**V**V**V*****V**V) >> >> I tried this as well. <flow id = "f1" color="1,1,1" begin = "0" >> type="Car" period="2.4" number="100" route="route0" departSpeed="13.9"> >> </flow> >> >> But it is the same as the previous. >> >> Is this is a bug or is there a workaround for this? >> >> Thanks, >> Dee. >> >> _______________________________________________ >> sumo-user mailing list >> [email protected] >> To change your delivery options, retrieve your password, or unsubscribe >> from this list, visit >> https://dev.eclipse.org/mailman/listinfo/sumo-user >> >> > _______________________________________________ > sumo-user mailing list > [email protected] > To change your delivery options, retrieve your password, or unsubscribe > from this list, visit > https://dev.eclipse.org/mailman/listinfo/sumo-user >
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