Extension of Safety Assessment Tool For Construction Work Zone Phasing Plans, August 2018

(2018) Extension of Safety Assessment Tool For Construction Work Zone Phasing Plans, August 2018. Transportation, Department of


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Engineering practitioners must balance safety and mobility when evaluating different construction phasing alternatives for highway work zones. There is a need for practitioner guidance and practical tools to assess work zone safety impacts as such resources are currently lacking. The objective of the study was to extend a structured safety assessment tool that was previously developed for freeways, expressways, and rural two-lane highways to include other facilities such as arterials, signalized intersections, unsignalized intersections, multi-lane highways, and ramps. Using Missouri data, this study introduces five new crash prediction models for work zones on urban multi-lane highways, arterials, ramps, signalized intersections, and unsignalized intersections. All the work zone models in this report are proposed for the first time. These work zone models are implemented in a user-friendly spreadsheet tool that automatically selects the appropriate model based on user input. The tool predicts crashes by severity, and computes the crash costs for each construction phasing alternative.

Item Type: Departmental Report
Keywords: construction phasing—highway safety—safety models—work-zone safety— work-zone scheduling
Subjects: Transportation
Transportation > Traffic safety > Work zones
ID Code: 29689
Deposited By: Hannah Gehring
Deposited On: 05 Feb 2019 12:58
Last Modified: 05 Feb 2019 12:58
URI: https://publications.iowa.gov/id/eprint/29689