[sumo-user] Car Following parameters - "Tau"

[Soumya Sharma <ssharm36@xxxxxxxx>]

Hello,

I am working with the CACC model to determine how it impacts freeway capacity. I studied in detail the algorithm for the CACC (https://www.sciencedirect.com/science/article/pii/S0968090X14002447?via%3Dihub and https://www.sciencedirect.com/science/article/pii/S0968090X1830528X?via%3Dihub). In addition, I looked at the code at (https://github.com/eclipse/sumo/blob/master/src/microsim/cfmodels/MSCFModel_CACC.cpp).

However, I was not able to see how the time headway shown in two papers is implemented in the code. I am particularly interested in decreasing this parameter. I did try to work with "tau", however, it is still not clear how "tau" is implemented in the CACC. 

Interestingly, when I set "tau = 1" it gives me the maximum flow. Any value greater (1.5, 2) or lower (0.1, 0.2, 0.3, 0.5) than 1 decreases the flow rate per hour. Could you let me know how timeHeadway is implemented in the CACC model and also what parameter should I change if I want lower time headways (for example I want to have a time headway of 0.5 sec between vehicles). 

I have attached my files for reference.

Thank you in advance.

--

Thank you,

Soumya Sharma

Graduate Research Assistant | ITRE 

PhD Civil Engineering | Transportation Systems | NC State 

AREMA Liaison | NC State Student Chapter 

LinkedIn

 

Attachment: CACC.rar
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