TP%231_f08 - CE 3102 Fall 2008 Speed Limits in Minnesota An...

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CE 3102 Fall 2008 Speed Limits in Minnesota An Application of Descriptive Statistics Minnesota state law sets statutory speed limits for several classes of roads. For example, the Mn/DOT’s Traffic Engineering Manual states: “30 miles per hour in an urban district or on a town road in a rural residential district;” “65 miles per hour on Interstate highways inside the limits of any urbanized area with a population of greater than 50,000” “70 miles per hour on Interstate highways outside the limits of any urbanized area with a population of greater than 50,000” “55 mph in locations other than those specified in this section” The Minnesota Dept. of Transportation has sole authority for approving deviations from the statutory limits. That is “On all streets and highways other than Trunk highways, the local authority must request investigation and authorization by Mn/DOT” Furthermore, the Minnesota Manual on Uniform Traffic Control Devices states: “When a speed limit is to be posted, it should be within 5 mph of the 85 th - percentile speed of free-flowing traffic.” You work for a county engineering department. A county council member believes
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TP%231_f08 - CE 3102 Fall 2008 Speed Limits in Minnesota An...

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