Use of roadway attributes in hot spot identification and analysis.
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2015-10-01
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Abstract:This research focuses on the addition of roadway attributes in the selection and analysis of ―hot spots.‖ This
is in conjunction with the framework for highway safety mitigation in Utah with its six primary steps: network
screening, diagnosis, countermeasure selection, economic appraisal, project prioritization, and effectiveness
evaluation. The addition of roadway attributes was included as part of the network screening, diagnosis, and
countermeasure selection, which are included in the methodology titled ―Hot Spot Identification and Analysis‖ in
UDOT Report No. UT-13.15. Included in this research was the documentation of the steps and process for data
preparation and model use for the step of network screening and the creation of report forms for the steps of
diagnosis and countermeasure selection.
The addition of roadway attributes is required at numerous points in the process. Methods were developed
to locate and evaluate the usefulness of available data. Procedures and systemization were created to convert raw
data into new roadway attributes, such as grade and vertical sag/crest curve location. For the roadway attributes to
be useful in selection and analysis, methods were developed to combine and associate the attributes to crashes on
problem segments and problem spots. The methodology for ―Hot Spot Identification and Analysis‖ was enhanced to
include steps for inclusion and defining of the roadway attributes. These methods and procedures were used to help
in the identification of safety hot spots to be analyzed and countermeasures selected. Examples of how the methods
are to function are given with sites from Utah’s state roadway network.
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