Re: [sumo-user] How to set fixed time gaps between vehicles?

[Camillo S <mssyli009@xxxxxxxxx>]

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 <m.barthauer@xxxxxxxxxxx> 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). 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" <mssyli009@xxxxxxxxx>

An: "Mirko Barthauer" <m.barthauer@xxxxxxxxxxx>

 

 

 

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 <m.barthauer@xxxxxxxxxxx> wrote:

Hi Camillo,

 

please read carefully the FAQ entry 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" <sumo-user@xxxxxxxxxxx>

An: "sumo-user@xxxxxxxxxxx" <sumo-user@xxxxxxxxxxx>

 

 

 

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