Why can't the 'special values' in the transportation fundamental diagrams always be determined? For example: Why can't I always determine the Free-flow speed (𝑣A), Capacity (𝑞B), Critical density (𝑘B), Speed at capacity (𝑣B), Jam density (𝑘C) from the fundamental diagrams?

Is it because of lack of data?

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Like why does the above diagram looks like that when it should look like this

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  • $\begingroup$ Where does the data come from? Add that to your question. $\endgroup$ Aug 2, 2022 at 16:19
  • $\begingroup$ Perhaps some traffic won't ever meet the conditions needed to populate parts of the curve you want to see... $\endgroup$
    – Solar Mike
    Aug 2, 2022 at 19:18


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