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]>
An: "Mirko Barthauer" <[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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