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Project Synopsis

SD1998-12

South Dakota needs to develop expected value analysis tables from accident data collected at random intersections located throughout the state. The values provide a standard for identifying abnormal accident characteristics in consideration of local roadways, drivers, and environmental conditions. The development and use of this statistical method could improve identification of serious safety problems at any intersection in South Dakota and could be used to determine if an intersection should be considered hazardous or not hazardous with relation to numbers of a particular type of accident.

South Dakota is a rural state with the majority of its rural highways having average daily traffic volumes of less than 3,000 vehicles per day. Eleven Class 1 Cities have populations ranging from 5,000 to 25,000. Two Class 1 Cities have populations of 55,000 and 110,000 respectively. A statistically valid sampling method needs to be developed to obtain intersection locations, characteristics, and other information necessary to create the expected value analysis tables for public roadways in South Dakota.

1 To develop an efficient means of evaluating intersections which may require safety improvements.

2 Develop expected value analysis tables based on South Dakota information.

1 Review and summarize literature and contact a representative number of State DOT’s and local agencies to identify what data, procedures, and sampling methods are being used to develop expected value analysis tables.

2 Meet with the project’s Technical Panel to review the project scope and work plan.

3 Obtain accident, traffic volume, and other data from the SDDOT, local units of government, and sampling methods, which are necessary to create the expected value analysis tables for the most current five year period.

4 Prepare the expected value analysis tables for each of the accident and location types approved by the Technical Panel.

5 Compare the expected value analysis tables developed for South Dakota to a representative sample of similar tables developed for other states and determine the applicability of using this method on intersections in South Dakota.

6 Prepare a final report and executive summary of the literature review, findings and conclusions, including expected value analysis tables for the State of South Dakota.

7 Make an executive presentation to the Research Review Board at the conclusion of the project.

SD1998_12_final_report.pdf

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