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Does 24+0=22+2? An Intro to HSM Methods. Jason J. Siwula, PE – Safety Engineer. Does 24+0=22+2?. On the surface it appears that 24=24 Sometimes items are not as simple as they seem…. 24 = 24. I see you x!. Placement makes a world of difference!.

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Does 24 0 22 2 an intro to hsm methods

Does 24+0=22+2?An Intro to HSM Methods

Jason J. Siwula, PE – Safety Engineer


Does 24 0 22 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



Placement makes a world of difference
Placement makes a world of difference!

Edgeline on edge of pavement with no room for shoulder

Edgeline placed with room for shoulder


Example case study
Example Case Study

Source: Hillary Isebrands (FHWA Office of Safety)


Example case study continued
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.


Example case study continued1
Example Case Study continued

Existing Conditions

11 ft. lanes, 1 ft. shoulders


What does that mean
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!


What is the hsm
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


Hsm part c predictive method
HSM Part C – Predictive Method

  • Introduces Safety Performance Functions (SPFs)

  • Predictive method for estimating expected average crash frequency of a:

    • Network

    • Facility

    • Individual Site


Hsm in kentucky
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


Interested in the hsm
Interested in the HSM?

  • http://www.highwaysafetymanual.org

  • http://safety.fhwa.dot.gov/hsm/

  • http://www.cmfclearinghouse.org



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