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Edition:Technical summary.
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Abstract:The American Association of State Highway and Transportation
Officials (AASHTO) publication titled A Policy
on Geometric Design of Highways and Streets (Green
Book) provides guidance to the designer by referencing
a recommended range of values for critical dimensions
for the design of new alignments and those undergoing
major reconstruction. These guidelines permit sufficient
flexibility to encourage independent designs for specific
situations. The approach allows the designer to use
flexibility to introduce “lower than typical” design values
for a specific element to address an impacted area. This
process allows for adjusting almost every aspect of the
geometric design and may require both state and federal
approval. Use of design flexibility may include use of a
design exception. The current version of the Indiana Design
Manual (IDM) provides and promotes some level of
flexibility, particularly on non-NHS routes. The selection
of design criteria for a transportation project is typically
screened by the highway system the project is located
on, functional classification, area type, forecasted traffic
data and classification of project type. The use of design
exceptions is one way to obtain design flexibility. Design
exceptions require appropriate level of justification.
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