Speed 2
Speed 2 : Distance travelled per unit time. (1) 85th percentile speed. The speed at which 85% of car drivers will travel slower and 15% will travel faster. operating speed of trucks. The 85th percentile speed of trucks measured at a time when traffic volumes are low. (2) Section operating speed. The value at which vehicle speeds on a series of curves tend to stabilise are related to the range of radii on the curves. See: Operating Speed, Street Speed and Design Speed
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