Operating Speed, 85th Percentile Speed (V85)
Operating Speed, 85th Percentile Speed (V85) : The speed at, or below which, 85 percent of vehicles travel under free flowing conditions passing a nominated point. Free flowing refers to a situation when a preceding vehicle has at least six and a half seconds of headway and there is no attempt to overtake a vehicle ahead (speed measurements should be made by unobtrusive means)