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Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
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Phoniex University
Oct-2001 - Nov-2016
Refer to the distribution of speeds in E55. Make a cumulative relative frequency plot of these speeds.
E55:
Did you ever wonder how speed limits on roadways are determined? Most government jurisdictions set speed limits by this standard practice, described on the website of the Michigan State Police.
Speed studies are taken during times that represent normal free-flow traffic. Since modified speed limits are the maximum allowable speeds, roadway conditions must be close to ideal. The primary basis for establishing a proper, realistic speed limit is the nationally recognized method of using the 85th percentile speed. This is the speed at or below which 85% of the traffic moves.
The 85th percentile speed typically is rounded down to the nearest 5 miles per hour. The table and histogram in Display 2.75 give the measurements of the speeds of 1000 cars on a stretch of road in Mellowville with no curviness or other additional factors. At what speed would the speed limit be set if the guidelines described were followed?


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