Speed flow curves have been provided, e.g. Exhibit 11-15.
It would be really useful if coefficients were provided for a range of road types, and for a range of speed-flow curves and volume-delay functions. Graphs are generally less useful than coefficients for calculations.
Gustavo Riente de Andrade
TECTRAN - Técnicos em Transportes ltda
Agreed. In a series of training courses I,ve been giving for highway professionals, that was a recurrent feedback they give me. People would like to have VDFs to do HCM calculations in an Excel spreadsheet. In my master thesis, I derived a basic formulation which can generate any speed-flow curve for a given value of FFS (not necessarialy rounded) for freeways and multilane highways. It's been proving very useful now.
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