IF IT AINT BROKE... AND OTHER SAFETY LESSONS Kendra Schenk, PE, - - PowerPoint PPT Presentation

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IF IT AINT BROKE... AND OTHER SAFETY LESSONS Kendra Schenk, PE, - - PowerPoint PPT Presentation

Jul 24, 2023 36 likes •420 views

IF IT AINT BROKE... AND OTHER SAFETY LESSONS Kendra Schenk, PE, PTOE, RSP Safety Lessons If i f it t aint aint br broke, d dont f fix ix it it Rul ules es a are e made t de to o be br brok oken Get yo

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“IF IT AIN’T BROKE...”

AND OTHER SAFETY LESSONS Kendra Schenk, PE, PTOE, RSP

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SLIDE 2

Safety Lessons

  • If i

f it t ain’t ain’t br broke, d don’t f fix ix it it

  • Rul

ules es a are e made t de to

  • be br

brok

  • ken
  • Get yo

your p prio iorit ities s straig aight

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SLIDE 3

Lesson 1

If it f it ai ain’t ’t br broke, e, don’ don’t fix t fix it it

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SLIDE 4

Laybourne Road

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Laybourne Road

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Laybourne Road

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Laybourne Road ALTERNATIVE 1 – NO-BUILD

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Laybourne Road

ALTERNATIVE 2 – TIGHT DIAMOND

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Laybourne Road

ALTERNATIVE 3 - ROUNDABOUT

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Laybourne Road

ALTERNATIVE 4 – PARCLO

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Laybourne Road

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Laybourne Road

2015 – 2017 2 Fixed Object Crashes 1 Backing Crash 0 Injuries

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Laybourne Road

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Laybourne Road

Features of the existing design that are performing well may remain unchanged, while features that are performing poorly should be improved, where practical.

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PREFERRED ALTERNATIVE Laybourne Road ALTERNATIVE 1 – NO-BUILD

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Lesson Summary

  • Perception is not always reality
  • Decisions (especially expensive ones) should

be based on data

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Lesson 2

Rul ules es are are mad made e to be br be broken en

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Gemini Parkway

NORTH

Gemini Parkway

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Gemini Parkway

EXISTING 74’ ALTERNATIVE 1 80’ ALTERNATIVE 2 74’ ALTERNATIVE 3 74’

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Gemini Parkway

PREDICTED CRASH FREQUENCY How the site/location should perform EXPECTED CRASH FREQUENCY How the site/location is actually performing Class Average Grade of Individual Student

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Gemini Parkway

6.87 26.90 31.81 134.05 199.63 5.87 23.64 27.59 96.18 153.29 5.97 23.98 27.96 96.74 154.65 6.02 24.13 28.13 97.91 156.19 50 100 150 200 250 KA B C O Total Crash Frequency (Crashes per Year) Existing Alt 1 Alt 2 Alt 3

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Gemini Parkway

Alternative 1 Alternative 2 Alternative 3 Fatal and Serious Injury

  • 1.00
  • 0.89
  • 0.85

Injury

  • 8.48
  • 7.67
  • 7.31

Total Crashes

  • 46.35
  • 44.98
  • 43.44

Construction Costs $7.44 M $5.48 M $5.48 M Safety B/C 2.07 2.61 2.49

ALTERNATIVE 1 ALTERNATIVE 2 ALTERNATIVE 3

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Gemini Parkway

  • Nearly $2M in cost savings
  • Design Exceptions for lane and inside shoulder

widths

ALTERNATIVE 2 PREFERRED ALTERNATIVE

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Gemini Parkway

In the past, designers sought to assure good traffic operational and safety performance for the design of specific projects primarily by meeting the dimensional design criteria in this policy. This approach was appropriate in the past because the relationship between the design dimensions and future performance was poorly understood. Traditional applications of this policy took the approach that, if the geometric design of a project met or exceeded specific design dimensional design criteria, it would likely to perform well. In some cases, this may have led to overdesign, constructing projects that were more costly than they needed to be, or were inappropriate for the roadway context.

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Lesson Summary

  • “Safest” option doesn’t always “win”
  • 12-foot lane widths aren’t required
  • Just because it’s “in the manual“ doesn’t mean

it’s “safe”

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Lesson 3

Get et yo your p ur pri riori rities es strai raight ght

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KY 185 – Warren County, Kentucky

5.5 mile segment

6

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KY 185 – Warren County, Kentucky

86 Crashes between January 1, 2012 to December 31, 2016

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KY 185 – Warren County, Kentucky

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KY 185 – Warren County, Kentucky

HSM Analysis for Existing Conditions – 2018 through 2037 HSM Analysis Comparison– 2018 through 2037

$23,290,000

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KY 185 – Warren County, Kentucky

Spot Improvement 1 1.8 mile segment

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KY 185 – Warren County, Kentucky

Spot Improvement 5 0.9 mile segment

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KY 185 – Warren County, Kentucky

HSM Analysis for Existing Conditions – 2018 through 2037

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KY 185 – Warren County, Kentucky

HSM Analysis Comparison– 2018 through 2037

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KY 185 – Warren County, Kentucky

64% of the Benefit 57% of the Cost COST SAVINGS

  • APPROX. $10M
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Lesson Summary

  • Don’t wait!
  • Use safety to help prioritize phased

improvements or overall projects

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SLIDE 37

Safety Lessons

  • If i

f it t ain’t ain’t br broke, d don’t f fix ix it it

  • Rul

ules es a are e made t de to

  • be br

brok

  • ken
  • Get yo

your p prio iorit ities s straig aight

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SLIDE 38

Questions?

Kendra Schenk, PE, PTOE, RSP 614-459-2050 Kendra.Schenk@BurgessNiple.com