What is HiSafe v3?

HiSafe software is a companion software to the AASHTO Highway Safety Manual (HSM). It implements Part C - Predictive Method and elements of Part D - Crash Modification Factors of the HSM. It also includes a benefit/cost module that enables users to compare project costs to monetized benefits of alternative safety improvements. Within the Part C module, HiSafe calculates the expected average number of crashes per year and over a specified design life for roadway segments and intersections. The methodology is consistent with the calculations and information presented in the HSM taking into consideration historic crash data, traffic volumes and geometric characteristics. The Part D module makes available crash modification factors for countermeasures commonly used for design exceptions and deviations from design standards.

These tools from the HSM can be easily integrated into every jurisdiction's project development process through design projects, or corridor/intersection alternatives analysis projects. With the this information from the HSM, the designer can test the safety tradeoffs of design decisions such as narrower lanes and a wider median, or narrower median and wider shoulders; and thus safety can meaningfully become part of the practical design process and/or least cost planning analyses. It allows for safety to be quantitatively assessed and meaningfully used as a project performance measures in conjunction with other typical project considerations such as community needs, roadway capacity, delay, cost, right-of-way, and environmental considerations.

The HiSafe software conducts the calculations and is an easy way to test alternatives. The facilities included in the HiSafe software are:

HSM Chapter Undivided Roadway Segments Divided Roadway Segments Intersections
Stop Control on Minor Leg Signalized
3-Leg 4-Leg 3-Leg 4-Leg
10. Rural Two-Lane Roads yes - yes yes - yes
11. Rural Multilane Highways yes yes yes yes - yes
12. Urban and Suburban Arterial Highways yes yes yes yes yes yes

Highway Safety Manual Workshops

Who should attend

The workshops will target staff and senior level engineers and planners who are interested in applying the Highway Safety Manual (HSM) Part C: Predictive Method on projects to assess the safety impacts of design options.

The workshop will be led by members of Kittelson & Associates, Inc.'s project team on NCHRP 17-36: Production of the First Edition Highway Safety Manual.

About the Workshop

The AASHTO Highway Safety Manual has four parts:

  1. Introduction and Fundamentals
  2. Roadway Safety Management Process
  3. Predictive Method
  4. Crash Modification Factors

Part C can be readily applied to any project where the engineer or planner is testing the safety impacts of different cross-sectional features of a roadway segment or intersection. It essentially provides a method for predicting the quantitative safety performance (i.e. crash frequency) of a particular facility.

To support application of the HSM, Kittelson & Associates is offering a daylong workshop to teach attendees how to apply Part C: Predictive Method. This will include fundamentals of the method, how to apply the material, how to interpret the results, and potential strengths and pitfalls of the method. The material will be demonstrated using real world project examples that engineers and planners face on a daily basis.


Workshops will be held in the cities listed below. If you are interested in attending one of the workshops, please contact Erin Ferguson for information on date, time, and workshop location.

Seattle, Washington  
Bend, Oregon  
Atlanta, Georgia  
Portland, Oregon  
San Francisco, California  
Boise, Idaho  
Chicago, Illinois  
Reston, Virginia  
Baltimore, Maryland  

The workshop cost is $250 per person.

→ Sign up for the workshops

We also offer tailored workshops for public agencies and learning institutions to address your specific interests and needs regarding the HSM. Tailored workshops can include information regarding all four parts of the HSM and focus on practical applications of the HSM. Please contact Erin Ferguson at eferguson@kittelson.com or 503-228-5230 for more information.

PDH Credit

Earn 8 professional development hours through the workshop.

What is the Highway Safety Manual?

The Highway Safety Manual provides the tools to conduct quantitative safety analyses. The manual includes methods for conducting a roadway safety management program, provides a predictive method to estimate crash frequency and severity under alternative designs or for future periods, and a catalog of crash modification factors for a variety of geometric features and treatment types. The goal of the manual is to provide quantitative procedures for measuring, estimating and evaluating roadways in terms of crash frequency and crash severity. Kittelson & Associates, Inc. (KAI) was the prime contractor responsible for producing the first edition of the Highway Safety Manual.

What it provides

  • Methods for conducting a roadway safety management program
  • A predictive method to estimate crash frequency and severity under alternative designs or for future periods
  • A catalog of crash modification factors for a variety of geometric & operational features

Inside the manual

  • Part A — Introduction and Fundamentals
    • Chapter 1: Introduction & Overview
    • Chapter 2: Human Factors
    • Chapter 3: Fundamentals
  • Part B — Roadway Safety Management Process
    • Chapter 4: Network Screening
    • Chapter 5: Diagnosis
    • Chapter 6: Select Countermeasures
    • Chapter 7: Economic Appraisal
    • Chapter 8: Prioritize Projects
    • Chapter 9: Safety Effectiveness Evaluation
  • Part C — Predictive Method
    • Chapter 10: Rural Two Lane Roads
    • Chapter 11: Rural Multilane Highways
    • Chapter 12: Urban and Suburban Arterials
  • Part D — Crash Modification Factors
    • Chapter 13: Roadway Segments
    • Chapter 14: Intersections
    • Chapter 15: Interchanges
    • Chapter 16: Special Facilities
    • Chapter 17: Road Networks

Many of the research documents produced in the development of the HSM are available online at http://www.highwaysafetymanual.org. With the appropriate roadway inventory, traffic volume, and crash data, the methods in the manual can be applied to activities at the state, county, regional and local levels. NCHRP Research Results Digest 329: Highway Safety Manual Data Needs Guide is designed to facilitate development of the appropriate databases.

Who is Digiwest?

Digiwest, LLC is a managed services provider specializing in technology solutions and software for the engineering industry.

Digiwest started in 1995 as an ISP, providing high quality dial-up and T1 services to engineering firms and their staff in the Portland Oregon market.

Today Digiwest has offices across the country supporting firms of all sizes with a variety of products in Alaska, Arizona, Florida, Idaho, Maryland, Oregon, Virginia, and Washington.

  • Ask us how our video conferencing technology can cut travel expenses in half and increase your team's productivity.
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  • Digiwest provides the highest quality managed services support, design, and installation, with helpdesk services for all your day-to-day technology needs. We are there for you 24-hours a day.

To see how Digiwest can make a difference for your firm, email or call our solutions team for a no obligation demonstration.