SWZDI Home Projects Board of Directors Events

Extension of Safety Assessment Tool for Construction Work Zone Phasing Plans

Status: Complete

Description: 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.

Report: extended_safety_assess_tool_for_WZ_phasing_w_cvr.pdf 7.1 mb (published 2018)

Other Document: Work Zone Safety Assessment Tool 1.3 mb *zip

State conducting research: Missouri

Authors:

  • Sun, Carlos (University of Missouri, Columbia)
  • Edara, Praveen (University of Missouri)
  • Brown, Henry (University of Missouri, Columbia)
  • Rahmani, Roozbeh (University of Missouri, Columbia)
Iowa State University does not discriminate on the basis of race, color, age, ethnicity, religion, national origin, pregnancy, sexual orientation, gender identity, genetic information, sex, marital status, disability, or status as a U.S. veteran. Inquiries regarding non-discrimination policies may be directed to Office of Equal Opportunity, Title IX/ADA Coordinator and Affirmative Action Officer, 3410 Beardshear Hall, 515 Morrill Road, Ames, Iowa 50011, Tel. 515 294-7612, Hotline: 515-294-1222, eooffice@iastate.edu.