Mapping target mean edge speeds to Calibrator flow (vehiclesPerHour)

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Hello everyone,

we have aggregated real-world average speeds per edge and time interval (e.g. from TomTom FCD) and want to reproduce these speeds in SUMO through realistic traffic dynamics rather than enforcing them via artificial speed constraints such as temporarySpeedSign or VSS.
The idea is to use Calibrators with plausible route or turn distributions and adjust the target flow (vehiclesPerHour) so that the resulting simulated mean edge speed approaches the observed speed. Is there a known or recommended relationship between the Calibrator flow parameter and the resulting mean speed on an edge (e.g. via an assumed fundamental diagram)?

Thank you in advance.