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Understanding HSM Methods: Enhancing Roadway Safety through Predictive Analysis

This article explores the complexities of roadway safety analysis using the Highway Safety Manual (HSM). We highlight a case study analyzing lane and shoulder configurations, revealing the potential for reducing crash rates without additional funding. By introducing Safety Performance Functions (SPFs), the HSM offers a scientific method to evaluate safety quantitatively. We discuss the application of predictive methods in project evaluation and the importance of using HSM tools for improving safety performance across transportation networks.

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Understanding HSM Methods: Enhancing Roadway Safety through Predictive Analysis

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  1. Does 24+0=22+2?An Intro to HSM Methods Jason J. Siwula, PE – Safety Engineer

  2. Does 24+0=22+2? • On the surface it appears that 24=24 • Sometimes items are not as simple as they seem… 24 = 24

  3. I see you x!

  4. Placement makes a world of difference! Edgeline on edge of pavement with no room for shoulder Edgeline placed with room for shoulder

  5. Example Case Study Source: Hillary Isebrands (FHWA Office of Safety)

  6. Example Case Study (continued) • Q: When resurfaced, can we influence safety on this roadway without utilizing any additional funds to do so? • A: Yes, with the HSM we can examine different lane/shoulder combinations to determine the best layout of the markings for safety performance.

  7. Example Case Study continued Existing Conditions 11 ft. lanes, 1 ft. shoulders

  8. What does that mean? Using the SPF for 2 lane rural highways for a 10 miles segment with 10,000 vpd we would estimate a base number of crashes to be 26.72 crashes per year. Existing Conditions 11 ft. lanes, 1 ft. shoulders 26.72*1.29=34.47 crashes per year (344.7 crashes in 10 years) 26.72*1.26=33.66crashes per year (336.6 crashes in 10 years) That’s a predicted savings of 8.1 crashes over 10 years!

  9. What is the HSM? • The Highway Safety Manual (HSM) introduces a science-based technical approach that takes the guesswork out of safety analysis • Provides tools to conduct quantitative safety analyses, allowing for safety to be evaluated alongside other transportation performance measures Source: http://www.highwaysafetymanual.org/Documents/HSMP-1.pdf

  10. HSM Part C – Predictive Method • Introduces Safety Performance Functions (SPFs) • Predictive method for estimating expected average crash frequency of a: • Network • Facility • Individual Site

  11. HSM in Kentucky? • Utilize HSIP funds to purchase HSMs for each District as well as the Central Office • Utilize HSM predictive methods in project evaluation and prioritization for new projects • KYTC Safety Engineers are evaluating the accompanying software package SafetyAnalyst for possible future implementation

  12. Interested in the HSM? • http://www.highwaysafetymanual.org • http://safety.fhwa.dot.gov/hsm/ • http://www.cmfclearinghouse.org

  13. Questions?

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