The only reference in Chapter 1 was a brief definition. If you think I am missing something, Why not post the relevant sections. I showed you where there was an online copy. Do I need to post the entire chapter as well?
Chapter 1 of the 2003 Edition (see ) has the following section that references the 85th percentile speed:
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"Speed-speed is defined based on the following clbuttifications: Advisory Speed-a recommended speed for all vehicles operating on a section of highway and based on the highway design, operating characteristics, and conditions. Average Speed-the summation of the instantaneous or spot-measured speeds at a specific location of vehicles divided by the number of vehicles observed. Design Speed-a selected speed used to determine the various geometric design features of a roadway. 85th-Percentile Speed-The speed at or below which 85 percent of the motor vehicles travel. Operating Speed-a speed at which a typical vehicle or the overall traffic operates. Operating speed might be defined with speed values such as the average, pace, or 85th-percentile speeds. Pace Speed-the highest speed within a specific range of speeds that represents more vehicles than in any other like range of speed. The range of speeds typically used is 10 km-h or 10 mph. Posted Speed-the speed limit determined by law and shown on Speed Limit signs. Statutory Speed-a speed limit established by legislative action that typically is applicable for highways with specified design, functional, jurisdictional and-or location characteristics and is not necessarily shown on Speed Limit signs."
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That is ALL of the references to the 85 percentile speed in Chapter 1. It doesn't anwer any of the questions I posed.
Please if I am missing something enlighten me.
Ed
