Evaluation of the 13 Controlling Criteria for Geometric Design (2014) / Chapter Skim
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Pages 42-48
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From page 42... ...
42 S E C T I O N 3 This section of the report reviews current practices of highway agencies with respect to design exceptions. Although all exceptions from applicable design policies should be documented in some manner, as specified in the policies of individual highway agencies, formal design exceptions are required by federal policy only for projects on the NHS for which agencies seek exceptions to the 13 controlling criteria.
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43 should be reviewed to determine which relationships are strongest (41)
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44 design elements (curve radius, superelevation, vertical curves, or lane width) where the designs specified in the controlling criteria could not be provided.
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45 Manual, "The purpose of the design exception process is to create a record that documents the engineering decisions leading to the approval of each exception from a design standard." The Relationship between Caltrans Policy and the 13 Controlling Criteria While the official design manual for the California highway system is the HDM, there are many references within the HDM to FHWA/AASHTO documents that can be used as supplementary information. Specifically, the Green Book, and the RDG are commonly referred to in the HDM.
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46 lane and/or shoulder width for its entire length, it may not make sense to upgrade a small section. Another factor in rural areas is environmental impacts.
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47 lengths for freeway ramps. (The latter is a state criterion, rather than one of the 13 controlling criteria.)
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48 needed, to utilize the minimum width of 5 ft in the U.S. Access Board's proposed Public Rights of Way Guidelines (PROWAG)
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