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Add support for quadratic linear fundamental diagram #125

Open MarkRaadsen opened 4 weeks ago

MarkRaadsen commented 4 weeks ago

See papers Raadsen and Bliemer on QL diagram, e.g., Bliemer, M. C. J., & Raadsen, M. P. H. (2019). Continuous-time general link transmission model with simplified fanning, Part I: Theory and link model formulation. Transportation Research Part B: Methodological, 126, 442–470. https://doi.org/10.1016/j.trb.2018.01.001

MarkRaadsen commented 4 weeks ago

Continue by fixing up deliberately failing test in PLANitIO that now uses QL diagram. Issue is that we do not provide a dCostdFlow for free flow branch of FDs in general --> add dSpeeddFlow in FD and then use length to convert to dCostdFlow. For QL use v(k) = gamma_max-alpha*k (and use this as well to add in functionality to get speed based on density) etc.