Clarifying the quadrennial needs study process.
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Clarifying the quadrennial needs study process.

Filetype[PDF-975.26 KB]


  • English
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    Details:

    • Creators:
      Cable, James K.
    • Corporate Creators:
      Iowa State University
    • Corporate Contributors:
    • Subject/TRT Terms:
    • Publication/ Report Number:
      HR-363
    • Resource Type:
      Tech Report
    • Geographical Coverage:
      Iowa
    • Edition:
      Final report.
    • Corporate Publisher:
      Iowa. Dept. of Transportation
    • Abstract:
      The Quadrennial Needs Study was developed to assist in the

      identification of highway needs and the distribution of road funds

      in Iowa among the various highway entities. During the period 1978

      to 1990, the process has seen large shifts in needs and associated

      funding distribution in individual counties with no apparent

      reasons. This study investigated the reasons forsuchshifts.

      The study identified program inputs that can result in major

      shifts in needs either up or down from minor changes in the input

      values. The areas of concern were identified as the condition

      ratings for roads and structures, traffic volume and mix counts,

      and the assignment of construction cost areas. Eight counties

      exhibiting the large shifts (greater than 30%) in needs over time

      were used to test the sensitivity of the variables. A ninth

      county was used as the base line for the study.

      Recommendations are identified for improvements in the process

      of data collection in the areas of road and structure condition

      --

      rating, traffic, and in the assignment of construction cost areas.

      Advice is also offered in how to account for changes in

      jurisdiction between successive studies. Maintenance cost area

      assignment and levels of maintenance service are identified as

      requiring additional detailed research.

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