Values.RouteVehicleOverviewSummarySourceSummarized details of the leg.
type nonrec t = {bestCaseDuration : DurationSeconds.t option;Total duration in free flowing traffic, which is the best case or shortest duration possible to cover the leg. Unit: seconds
*)distance : DistanceMeters.t option;Distance of the step.
*)duration : DurationSeconds.t option;Duration of the step. Unit: seconds
*)typicalDuration : DurationSeconds.t option;Duration of the computed span under typical traffic congestion. Unit: seconds
*)}