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Implementing the Highway Safety Manual in Missouri: A Comprehensive Approach to Safety Enhancement

This document outlines the implementation strategy for the Highway Safety Manual (HSM) by the Missouri Department of Transportation. It emphasizes the necessity of applying quantitative research to improve roadway safety, utilizing tools like HCM and various traffic simulation software. Key components include establishing an HSM implementation team, scheduling training for staff, integrating HSM into MoDOT processes, and providing ongoing technical support. The plan aims to increase safety awareness and facilitate the use of data-driven decision-making to enhance traffic safety measures across Missouri.

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Implementing the Highway Safety Manual in Missouri: A Comprehensive Approach to Safety Enhancement

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  1. Implementing the Highway Safety Manual Jon Nelson, P.E. Sr. Traffic Studies Specialist Missouri Department of Transportation

  2. Knowing is not enough; we must apply. - Leonardo da Vinci

  3. Science-based, quantitative research • Synthesis of previous research • New research commissioned by AASHTO and FHWA (peer reviewed through the National Academies)

  4. The Need of the HSM • Quantify safety; a decision-making tool • HCM • CORSIM • PASSER • TRANSYT7F • VISSIM • TNM ver 2.5 • CAL3QHC • Mobile 5a • 3-D Visualization • CITYGREEN • GEOPAK Plans • Cost Models • Real estate appraisals • DOT databases ? • HSM More Importance More Quantitative Safety Environmental Traffic Operations Right-of-Way Costs Impacts Impacts

  5. Missouri’s Implementation Plan • Obtain support materials • Increase understanding within MoDOT • Establish an HSM implementation team • Schedule training • Integrate into MoDOT process • Provide technical support • Other issues

  6. Support Materials • Obtain the HSM (10 free) • SafetyAnalyst • www.safetyanalyst.org • Interactive Highway Safety Design Model (IHSDM) • www.ihsdm.org • CMF Clearinghouse • www.cmfclearinghouse.org • HSM PowerPoint

  7. Increase Understanding • Meet with senior management • Meet with Chief Counsel’s Office • Meet with division directors • Planning • Design • Traffic • Meet with district engineers • Present at division meetings

  8. Establish Implementation Team • Representatives from affected areas • Planning • Design • Traffic • Highway Safety • District representation • Help facilitate acceptance/use of HSM • Serve as liaisons

  9. Schedule Training • Implementation Team • HSM webinars (FHWA Resource Center) • Familiarity • Hands-on Workshops (2-day) • FHWA/NHI • Completed once; will host again in fall • Calculations, practice problems, exams, etc. • Show them how it works. • Keep it simple. • Develop in-house training (1-day)

  10. Integrate Into Process • Project Development • Project selection • Design Alternatives • Design Exceptions • Best value

  11. Integrate Into Process • Safety assessments of existing facilities • Determine need for countermeasures • Select & evaluate optimal countermeasures • Striping, signing, shoulders, rumbles, etc.

  12. Provide Technical Support • Central Office support of districts • HSM lead contact • Super Users • Adapt to Missouri conditions/data • Safety Performance Functions • Calibration factors

  13. Other Issues • Continue training opportunities • HSM Lead State Initiative • NCHRP Project 17-50 • Expand awareness to outside partners • Local agencies • Knowledge • Training • Materials

  14. Challenges • Communicating the need • Not “extra work” • Don’t complicate the process • Making HSM analysis routine • Environmental, simulations, etc. • Overcoming liability concerns • Adjusting to your state’s conditions • Appropriate usage • Drive down the numbers • System-wide approach

  15. Challenges • Accompanying software • SafetyAnalyst • IHSDM • Analyzing unconventional designs

  16. Other Considerations • Begin the discussion now • Incorporate workshops into existing meetings • IDOT – Traffic and Safety Conference • Develop real-world scenarios & examples • Supply materials for the districts/regions • IDOT – 50 copies

  17. Implementation will not happen on its own.

  18. Information • www.highwaysafetymanual.org • Jon Nelson, P.E. • Missouri Department of Transportation • Senior Traffic Studies Specialist • 573-751-1157 • Jonathan.Nelson@modot.mo.gov

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