Integrating Safety into the Transportation Decision Making Process
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1 Wednesday, February 17th, 2016 Integrating Safety into the Transportation Decision Making Process Priscilla Tobias, PE State Safety Engineer Illinois Department of Transportation
2 Increased Focus of Safety Nationally
3 Strategic Highway Safety Plan SHSP Number of Fatalities & Serious Injuries Fatalities & Ser. Injury Rate Zero Fatality Goal Emphasis Areas State and Local Roadways Urban/Rural Data Driven Priority 1,2, and 3 Strategies Engineering Enforcement Education EMS
4 Percentage of Severity Group By Emphasis Area: Fatalities and A-Injuries, % 50% Priority Level One (any Severity Group 30%) Severity Groups Fatalities 40% Percentage* 30% 20% Priority Level Two (any Severity Group 10%) 10% Priority Level Three (all Severity Group <10%) 0% Emphasis Area Date: 2/23/2015 Source: 2005 to 2014 IDOT Crash Extracts
5 Typical Reported Crash Causes 3% 27% 57% Roadway 34 % 1% 2% 3% 6% Vehicle 12% Driver 93 %
6 The HSM is a Tool to Change How We Consider Safety Nominal Safety Substantive Safety Examined in reference to compliance with standards, warrants, guidelines and sanctioned design procedures The expected or actual crash frequency and severity for a highway or roadway
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14 Safety &Transportation Management Process Network Screening Ranking Prioritization Countermeasure Selection, B/C Compare Alternatives, Safety Impact vs. Other Impacts (Environment, etc): Site Analysis and Diagnosis Countermeasure Selection Economic Analysis Planning & Programming Scoping and Phase I Evaluating System Performance Evaluating Project & Countermeasures Evaluation & Performance Measurement Design & Construction Design Exceptions & Deviations Design Build Countermeasure Selection, B/C Operations & Maintenance Site Analysis & Diagnosis Countermeasure Selection Economic Analysis
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17 Network Screening Evolution HALIS Fortran Based, Frequency Driven 2006 Maps Fatal/Serious Injury Crash by Collision Type % List & Crash Weighting Method 2008 Safety Performance Functions (SPF) 2014 Local 5% List 2015 Safer Roads Index (SRI): Safety Tiers
18 IDOT Network Screening HSM Part B
19 IDOT Network Screening SPFs Developed Illinois Center for Transportation UIUC State Route System Five years of KAB Crashes (108K) 16K miles of roadway 55K intersections Models Negative Binomial Based on AADT and Length 12 segment peer groups 8 intersection peer groups
20 High Potential for Safety Improvement Lists of high priority locations (5% location and Critical PSI) Statistics that identify areas for potential enforcement PSI - Urban Multilane Divided 2010 Reporting, IL DOT State Jurisdiction Highways 600 PSI Value Sites
21 Five Percent Reporting PSI = 152 Fixed Object and Overturn = 51% Rear End and Same Direction Sideswipe = 35%
22 Safer Roads Index (SRI) & Safety Tiers Tiers based on: Potential for Safety Improvement (PSI) Fatal and A-Injury crashes Performance metric for programming process and project selection Used like construction management & pavement/bridge/infrastructure condition evaluation and maintenance First provided in 2015 FIVE PERCENT Report Goes beyond the simple Yes/No answer of being a FIVE PERCENT location
23 Intersections and Safety Tiers 23
24 Roadway Segments and Safety Tiers 24
25 Intersections Before Intersections After
26 Segments Before... Segments After... 26
27 IDOT Performance Measures Condition Rating System (CRS) Structural: Loss of load carrying capacity or structural breakdown International Roughness Index (IRI) Functional/Surface: Excessive roughness impacting functional usability and causing drive discomfort Safer Roads Index (SRI) Safety Performance (PSI): Establishes safety risk based on historical severe crashes and exposure CRS Range State of Repair 9.0 to 7.6 Excellent 7.5 to 6.1 Good 6.0 to 4.6 Fair 4.5 to 1.0 Poor IRI Range (in/mi) SRI Range 1 to 94 Good 95 to 177 Fair > 177 Poor Minimal Low Medium High Good Minor Moderate Severe 5% 5%
28 Transportation System & Performance Measures Legend 28
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30 Safety Scoring 30
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33 4 A-Injury Crashes 2 Roadway Departure 1 Rear End 1 Animal 0 K+A Crashes 1 A-Injury Crash 1 Rear End 3 A-Injury Crashes 2 Roadway Departure 1 Rear End 1 Fatal Crash 1 Head On 33
34 Local FIVE PERCENT Safety Tiers 3 + Illinois Local System Segments Tiers Segment Safety Tiers based on: Frequency of KA and KAB crashes Entire local system divided into three tiers B Crashes/Yr 2 1 Tier 2: One or more B Crashes Tier 1: One or more KA Two or more KAB Tier 3: Zero KAB Crashes Tier 2: One KA crash KA Crashes/Yr + Intersection Safety Tiers based on: KAB weighted and KA crash rates Ranked from high to low, first by KAB weighted crash rate, then by KA crash rate Illinois Local System Four Leg Intersections Tiers Tier 1: 5% Tier 2: Between 5% and Average Four leg intersections divided into three tiers Tier 3: Below Average KAB Weighted Crash Rate 34
35 Next Steps Incorporate SRI/Safety Tier PSI into IDOT s Roadway Inventory System (IRIS) and Program Planning System (PPS). Identify those roadway and geometric features that contribute to the occurrence of severe crashes. Incorporate Systemic Safety Improvements into programming process and make changes to design and operation policies. Expand Network Screening SPFs to local roadway system and develop a SRI
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