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Edition:Final report.
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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
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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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