Understanding Highway Safety Manual (HSM) Methods

The Highway Safety Manual (HSM) introduces a science-based approach to safety analysis, providing tools for quantitative evaluation of safety alongside other transportation performance measures. Examples and case studies demonstrate the impact of design choices on safety outcomes, illustrating the predictive methods used to estimate crash frequencies and improve roadway safety.

• Highway safety
• Safety analysis
• Transportation performance
• Predictive methods

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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

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*1.26=33.66crashes per year 26.72*1.29=34.47 crashes per year (344.7 crashes in 10 years) (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?