Hi Camillo,
there is no such feature. So if you have a custom car-following model, then
we cannot help you much with that. The car-following model determines the
headway and consequently the density...
Best regards
Mirko
-----Original-Nachricht-----
Betreff: Re: [sumo-user] How to set fixed time gaps between vehicles?
Datum: 2023-11-03T07:45:18+0100
Von: "Camillo S" <[email protected]>
An: "Mirko Barthauer" <[email protected]>
Sorry i meant does not reach the intended density .
On Fri, 3 Nov 2023, 07:43 Camillo S, <[email protected]
<mailto:[email protected]> > wrote:
Hi Mirko,
I am using my own control algorithm for this purpose. Currently i am just
specifying a number that coincides with the length of the road but it
does reach the intended density when i introduce the ego vehicle. Is
there a way to force the ego vehicle to enter the simulation only once
the density is reached through the route file?
Thank you.
On Thu, 26 Oct 2023, 16:30 Mirko Barthauer, <[email protected]
<mailto:[email protected]> > wrote:
Hi Camillo,
can you please say which car-following model you use? We had some
issues (see here <https://github.com/eclipse-sumo/sumo/pull/13755> )
with ACC recently which could impact your task.
Best regards
Mirko
-----Original-Nachricht-----
Betreff: Re: [sumo-user] How to set fixed time gaps between vehicles?
Datum: 2023-10-26T14:57:50+0200
Von: "Camillo S" <[email protected] <mailto:[email protected]> >
An: "Mirko Barthauer" <[email protected]
<mailto:[email protected]> >
Hi Mirko,
thanks for these tips. I am actually still not able to solve this
problem. Firstly I am using a custom model and i only have one lane. I
tried your approach but i think because i am using a custom model it
does not consider this tau value in the calculation. My requirement is
to ensure there are 80veh/km in a 5km straight road stretch and i would
like to have the scene achieved the moment the ego vehicle is
introduced in the scenario so that it can experience this density. Can
this be done without Traci?
Thank you.
Best regards,
Camillo
On Tue, 17 Oct 2023 at 10:06, Mirko Barthauer <[email protected]
<mailto:[email protected]> > wrote:
Hi Camillo,
tau is a car-following model parameter which defines the time gap
between the vehicles and can be defined in the vehicle type
definition inside the route file (see docs
<https://sumo.dlr.de/docs/Definition_of_Vehicles%2C_Vehicle_Types%2C_and_Routes.html#car-following_model_parameters>
). So basically you define a vehicle type like this:
<vType id="myType" tau="1" />
At tau = 1s the distance to the leading vehicle when driving at
7.885m/s is 7.885m (no rocket math here ;-)). Obviously I have left
out all the other possible vehicle type attributes you can find in
the documentation. The vehicle type can be referenced by its ID in
the flow using the type attribute.
Best regards
Mirko
-----Original-Nachricht-----
Betreff: Re: [sumo-user] How to set fixed time gaps between vehicles?
Datum: 2023-10-16T21:18:07+0200
Von: "Camillo S" <[email protected] <mailto:[email protected]> >
An: "Mirko Barthauer" <[email protected]
<mailto:[email protected]> >
Hi Mirko,
Thank you for the link. I tried the solution and understood the way
to define the constant density but I am not sure I understood how to
define the fixed time gap/spacing between the vehicles..I can't
really understand what the sentence below means and how to change the
tau value. Thanks.
* at a default value of tau=1 (desired time headway excluding
minGap) this means vehicles will be in a stationary state at
7.885m/s
On Mon, 16 Oct 2023 at 18:01, Mirko Barthauer <
[email protected] <mailto:[email protected]> > wrote:
Hi Camillo,
please read carefully the FAQ entry
<https://sumo.dlr.de/docs/FAQ.html#how_do_i_insert_vehicles_with_a_fixed_density>
about constant density and get back if you have more questions.
Best regards
Mirko
-----Original-Nachricht-----
Betreff: [sumo-user] How to set fixed time gaps between vehicles?
Datum: 2023-10-16T17:36:59+0200
Von: "Camillo S via sumo-user" <[email protected]
<mailto:[email protected]> >
An: "[email protected] <mailto:[email protected]> " <
[email protected] <mailto:[email protected]> >
Hi all,
I would like to fix the movement of the vehicles with a fixed time
gap between them so that they will move in a platoon like manner. I
tried to find the solution in the documentation to adjust the flow
information but I am not able to understand how to do this
correctly. I would like to have a density of 80 vehicles/km with a
time gap of 2 seconds between the vehicles. Can this be defined in
the route file itself? Thank you.
Best,
Camillo
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