Although I don't get how you obtain several dozens of buses with twice
the insertion probability of 0,0015. With very small flows, the relative
variance can get quite large, so for some simulations, it might just be
10 vehicles in total and 30 in others, but never 110.
Anyway, see the docs
<https://sumo.dlr.de/docs/Simulation/Randomness.html>for some
suggestions how to procede. If you only have buses, maybe just insert
them at regular intervals and add an offset
*--random-depart-offset*/<TIME>/
<https://sumo.dlr.de/docs/Basics/Notation.html#referenced_data_types>.
Best regards
Mirko
Am 27.07.2022 um 15:35 schrieb Jaime Moya:
Hi Mirko,
The scenario consists of a one lane road where only buses are being
modelled. The flows vary between 10 b/h and 110 b/h.
The buses are inserted at the route begin and there is no spillback.
On the following image, I plotted the cumulative number of buses for
each line (each graph is a replication)
image.png
As you can see, more 517 buses are inserted in almost all cases. Could
it be related to randomness? How can I balance the number of buses,
without inserting them at regular intervals?
Thanks in advance,
Kind regards
--
Jaime Moya
Pontificia Universidad Católica de Chile
El mar, 26 jul 2022 a las 3:13, [email protected]
(<[email protected]>) escribió:
Hi Jaime,
that's difficult to guess without knowing more about your
scenario. Did you check whether the buses are inserted at the
route begin at all? Maybe there is a spillback queue or many other
vehicles want to enter the simulation at the same place, such that
SUMO cannot place new vehicles on the road safely. If your network
is too big to do this manually, think of placing a detector
<https://sumo.dlr.de/docs/Simulation/Output/Induction_Loops_Detectors_%28E1%29.html>
(with attribute vTypes="vehDist_IDM_bus") at the route begin or
adding FCD output
<https://sumo.dlr.de/docs/Simulation/Output/FCDOutput.html> to
your bus vehicle type to get relevant output for further diagnosis.
Mirko
-----Original-Nachricht-----
Betreff: [sumo-user] Modelling two bus lines of equal frequency
Datum: 2022-07-25T18:59:30+0200
Von: "Jaime Moya" <[email protected]>
An: "Sumo project User discussions" <[email protected]>
Hi,
I am modelling two bus lines of equal frequency, but different
stop times at bus stops. To avoid buses being inserted at perfect
regular times, I am using probability:
<flow id="517" type="vehDist_IDM_bus" line="517" begin="0.00"
route="Ruta_517" end="4500" probability="0.0015" />
<flow id="518" type="vehDist_IDM_bus" line="518" begin="0.00"
route="Ruta_518" end="4500" probability="0.0015" />
However, in many scenarios I am obtaining big differences in the
number of simulated buses of one line with respect to the other
(line 517 vs line 518). For example, the following graph shows the
difference (number of 517 buses minus number of 518 buses) for a
number of simulated scenarios:
image.png
These differences are important because I am getting results with
noise. I don't want to use "vehsPerHour" or "number" because the
buses would be equally spaced. Should I use period [exp(x)]? Doing
so would balance the number of 517 and 518 simulated buses?
Thanks in advance.
Kind regards,
--
Jaime Moya
Pontificia Universidad Católica de Chile
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