Ideal conditions in Flow Segment Data


I don’t understand the meaning of freeFlowTravelTime and freeFlowSpeed or rather the meaning of ideal conditions cause i have obtained different value of these fields for the same geografical coordinates. The following image should make me clearer (coordinates are replaced by name of streets).

Thanks in advance.

Those values are from a time period when there is no big traffic (for instance at night).
It has no direct connection to speed limits. It is just a speed that vehicles are traveling with at that conditions.

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So at every request those fields are calculated according to certain current conditions thus i can have several ideal values of speed and travel time? I was thinking at ideal condition as the best conditions of travelling thus always the same for certain geografical coordinates. Moreover, freeFlowSpeed changes at not so large time intervals.