Following the pioneer work done by Greenshields on Traffic Flow Theory and Characteristics, several relationships to characterize traffic flow have evolved notably ● Greenberg’s model: Vs = Vm ln (Kj / K) ● Underwood’s model: Vs = Vf e-k / km ● Drew’s model: U = Uf [1 – (k/kj)(n +1/2)] ● Pipe & Munjal: U = Uf [1 – (k/kj)n In tabular form, compare and contrast the four traffic flow theory models with Greenshields’ original model, Us = Uf [1 – (k/kj)]?

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Green shields original model Ug Us 3 Green bergs mod... View the full answer