第85百分位速率
第85百分位速率（英文：85th percentile speed）或第85百分位规则，是一项交通工程标准，用于设定公共道路上車輛的速限。它指的是某個特定速率，會有85%的驾驶人，行駛在此特定速率或以下。[1][2]
速率最慢的1%排在前，是第1百分位；速率最快的1%排在後，是第100百分位。因此，第85百分位，意思就是在此百分位的駕駛人，他們的速率會超越85%的駕駛人。
参考文献
- ^ McKinley, Jesse. Is 70 M.P.H. the New 65? Legislators Say N.Y. Roads Are Just Too Slow.. The New York Times. March 23, 2023 [September 15, 2023]. （原始内容存档于2023-12-28）.
States set speed limits using a variety of methods and measurements, including the so-called 85 percentile rule, which refers to the speed 'at or below which 85 percent of the drivers travel on a road segment', according to the Federal Highway Administration.
- ^ Minor, Nathaniel. A lower speed limit could be coming to a Colorado road near you. Colorado Public Radio. September 15, 2023 [September 15, 2023]. （原始内容存档于2023-12-28）.
Traditionally, U.S. traffic engineers use the '85th percentile' method that sets limits at the speed at or below which 85 percent of drivers travel in normal conditions. This federally approved approach has been used by state and local transportation agencies since at least the '60s, but street safety advocates and city transportation officials deride the method because it usually leads to higher speed limits and faster speeds, which is associated with more serious crashes.