FHWA Crash Modification Factors Clearinghouse Karen Scurry FHWA
![FHWA Crash Modification Factors Clearinghouse Karen Scurry – FHWA Office of Safety Daniel Carter FHWA Crash Modification Factors Clearinghouse Karen Scurry – FHWA Office of Safety Daniel Carter](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-1.jpg)
![Introduction • What is the CMF Clearinghouse? • What is the purpose of the Introduction • What is the CMF Clearinghouse? • What is the purpose of the](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-2.jpg)
![Agenda • • What is a CMF? Where does the information come from? Searching Agenda • • What is a CMF? Where does the information come from? Searching](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-3.jpg)
![What is a Crash Modification Factor? • A CMF is a multiplicative factor – What is a Crash Modification Factor? • A CMF is a multiplicative factor –](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-4.jpg)
![What is the purpose of a CMF? • The purpose of a CMF is What is the purpose of a CMF? • The purpose of a CMF is](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-5.jpg)
![Scope • Clearinghouse contains CMFs from studies that are: – Crash based – Focused Scope • Clearinghouse contains CMFs from studies that are: – Crash based – Focused](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-6.jpg)
![Original Sources • Highway Safety Manual Knowledge Document (1 st edition) • FHWA Desktop Original Sources • Highway Safety Manual Knowledge Document (1 st edition) • FHWA Desktop](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-7.jpg)
![Regularly Reviewed Sources • Transportation Research Board papers • Journal articles (ASCE, ITE, etc. Regularly Reviewed Sources • Transportation Research Board papers • Journal articles (ASCE, ITE, etc.](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-8.jpg)
![Critical Review Process • Purpose – Gather details about studies and CMFs – Evaluate Critical Review Process • Purpose – Gather details about studies and CMFs – Evaluate](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-9.jpg)
![Clearinghouse Review Process • • • Structured but subjective process Star rating – what Clearinghouse Review Process • • • Structured but subjective process Star rating – what](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-10.jpg)
![Searching on the Clearinghouse • Quick search and advanced search • Search terms – Searching on the Clearinghouse • Quick search and advanced search • Search terms –](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-11.jpg)
![Interpreting Search Results • • • What is displayed in the search results? Why Interpreting Search Results • • • What is displayed in the search results? Why](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-12.jpg)
![Using Search Results • Factors in choosing a CMF – Crash type and severity Using Search Results • Factors in choosing a CMF – Crash type and severity](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-13.jpg)
![Guest Speaker • Shawn Troy, NCDOT Safety Evaluation Group Guest Speaker • Shawn Troy, NCDOT Safety Evaluation Group](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-14.jpg)
![Study Details • Details on original study • Shows all CMFs produced by the Study Details • Details on original study • Shows all CMFs produced by the](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-15.jpg)
![Demonstration Searches • • Left turn lane installation HAWK signal J-turns Bicycle lanes and Demonstration Searches • • Left turn lane installation HAWK signal J-turns Bicycle lanes and](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-16.jpg)
![HAWK signal (pedestrian hybrid beacon) HAWK signal (pedestrian hybrid beacon)](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-17.jpg)
![J-turn J-turn](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-18.jpg)
![Wrap up • Newsletter sign up http: //www. cmfclearinghouse. org/newsletter_signup. cfm • User feedback Wrap up • Newsletter sign up http: //www. cmfclearinghouse. org/newsletter_signup. cfm • User feedback](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-19.jpg)
![Questions? www. CMFClearinghouse. org Karen Scurry, P. E. FHWA Office of Safety Programs 609 Questions? www. CMFClearinghouse. org Karen Scurry, P. E. FHWA Office of Safety Programs 609](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-20.jpg)
- Slides: 20
![FHWA Crash Modification Factors Clearinghouse Karen Scurry FHWA Office of Safety Daniel Carter FHWA Crash Modification Factors Clearinghouse Karen Scurry – FHWA Office of Safety Daniel Carter](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-1.jpg)
FHWA Crash Modification Factors Clearinghouse Karen Scurry – FHWA Office of Safety Daniel Carter – UNC HSRC Shawn Troy – NCDOT CMF Clearinghouse Webinar, 12/13/12
![Introduction What is the CMF Clearinghouse What is the purpose of the Introduction • What is the CMF Clearinghouse? • What is the purpose of the](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-2.jpg)
Introduction • What is the CMF Clearinghouse? • What is the purpose of the Clearinghouse? – Provide CMFs to users – Provide information and education on how to use CMFs – Link to other CMF resources • Why are we here? • Housekeeping
![Agenda What is a CMF Where does the information come from Searching Agenda • • What is a CMF? Where does the information come from? Searching](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-3.jpg)
Agenda • • What is a CMF? Where does the information come from? Searching on the CMF Clearinghouse Interpreting search results Using search results North Carolina example Study details Demonstrations – Searches – User questions/scenarios
![What is a Crash Modification Factor A CMF is a multiplicative factor What is a Crash Modification Factor? • A CMF is a multiplicative factor –](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-4.jpg)
What is a Crash Modification Factor? • A CMF is a multiplicative factor – Indicates the proportion of crashes that would be expected after implementing a countermeasure. Example: CMF = 0. 8 • CRF vs. CMF – Crash reduction factor (20%) – Crash modification factor (0. 8)
![What is the purpose of a CMF The purpose of a CMF is What is the purpose of a CMF? • The purpose of a CMF is](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-5.jpg)
What is the purpose of a CMF? • The purpose of a CMF is to estimate the number of crashes expected after implementing a countermeasure. – Capture the greatest gain with limited funds. • Identify most cost-effective strategy. • Identify most cost-effective locations. – Compare safety consequences among various alternatives. – Compare results of new analyses with existing CMFs to check reasonableness. – Check validity of assumptions in cost-benefit analyses.
![Scope Clearinghouse contains CMFs from studies that are Crash based Focused Scope • Clearinghouse contains CMFs from studies that are: – Crash based – Focused](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-6.jpg)
Scope • Clearinghouse contains CMFs from studies that are: – Crash based – Focused on infrastructure characteristics or modifications (i. e. , engineering) – Focused on producing a CMF – Explicitly reporting a CMF
![Original Sources Highway Safety Manual Knowledge Document 1 st edition FHWA Desktop Original Sources • Highway Safety Manual Knowledge Document (1 st edition) • FHWA Desktop](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-7.jpg)
Original Sources • Highway Safety Manual Knowledge Document (1 st edition) • FHWA Desktop Reference Guide for Crash Reduction Factors
![Regularly Reviewed Sources Transportation Research Board papers Journal articles ASCE ITE etc Regularly Reviewed Sources • Transportation Research Board papers • Journal articles (ASCE, ITE, etc.](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-8.jpg)
Regularly Reviewed Sources • Transportation Research Board papers • Journal articles (ASCE, ITE, etc. ) • Other research reports (open TRID search) • State research reports • User submitted studies
![Critical Review Process Purpose Gather details about studies and CMFs Evaluate Critical Review Process • Purpose – Gather details about studies and CMFs – Evaluate](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-9.jpg)
Critical Review Process • Purpose – Gather details about studies and CMFs – Evaluate quality and determine if included in Clearinghouse • Preliminary review – Determine if study is eligible for Clearinghouse – Gather all applicable data on the study and CMFs • Critical review – Examine data and establish star quality rating
![Clearinghouse Review Process Structured but subjective process Star rating what Clearinghouse Review Process • • • Structured but subjective process Star rating – what](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-10.jpg)
Clearinghouse Review Process • • • Structured but subjective process Star rating – what it is, what it isn’t Star quality rating criteria (Excellent, Fair, Poor) 1. 2. 3. 4. 5. Study design Sample size Standard error Potential bias Data source
![Searching on the Clearinghouse Quick search and advanced search Search terms Searching on the Clearinghouse • Quick search and advanced search • Search terms –](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-11.jpg)
Searching on the Clearinghouse • Quick search and advanced search • Search terms – Match all words, match any words, match exact phrase – Blank searches • Narrowing fields – “All” returns only CMFs addressing “all” types/severities
![Interpreting Search Results What is displayed in the search results Why Interpreting Search Results • • • What is displayed in the search results? Why](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-12.jpg)
Interpreting Search Results • • • What is displayed in the search results? Why do some CMFs look the same? From search results to CMF details Missing data – dependent on study author Excel output HSM indications
![Using Search Results Factors in choosing a CMF Crash type and severity Using Search Results • Factors in choosing a CMF – Crash type and severity](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-13.jpg)
Using Search Results • Factors in choosing a CMF – Crash type and severity – Facility type – Star rating – Others: AADT range, state of origin, etc. • APPLICABILITY is key • Science of CMFs course
![Guest Speaker Shawn Troy NCDOT Safety Evaluation Group Guest Speaker • Shawn Troy, NCDOT Safety Evaluation Group](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-14.jpg)
Guest Speaker • Shawn Troy, NCDOT Safety Evaluation Group
![Study Details Details on original study Shows all CMFs produced by the Study Details • Details on original study • Shows all CMFs produced by the](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-15.jpg)
Study Details • Details on original study • Shows all CMFs produced by the study
![Demonstration Searches Left turn lane installation HAWK signal Jturns Bicycle lanes and Demonstration Searches • • Left turn lane installation HAWK signal J-turns Bicycle lanes and](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-16.jpg)
Demonstration Searches • • Left turn lane installation HAWK signal J-turns Bicycle lanes and superelevation
![HAWK signal pedestrian hybrid beacon HAWK signal (pedestrian hybrid beacon)](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-17.jpg)
HAWK signal (pedestrian hybrid beacon)
![Jturn J-turn](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-18.jpg)
J-turn
![Wrap up Newsletter sign up http www cmfclearinghouse orgnewslettersignup cfm User feedback Wrap up • Newsletter sign up http: //www. cmfclearinghouse. org/newsletter_signup. cfm • User feedback](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-19.jpg)
Wrap up • Newsletter sign up http: //www. cmfclearinghouse. org/newsletter_signup. cfm • User feedback is important • NHI courses available – Application of Crash Reduction Factors (course FHWA-NHI-380093) – Science of Crash Reduction Factors (course FHWANHI-380094 • Email certification for continuing education credit • Future webinars
![Questions www CMFClearinghouse org Karen Scurry P E FHWA Office of Safety Programs 609 Questions? www. CMFClearinghouse. org Karen Scurry, P. E. FHWA Office of Safety Programs 609](https://slidetodoc.com/presentation_image_h2/901ed72256fd3e623860d60d5ee3d5cc/image-20.jpg)
Questions? www. CMFClearinghouse. org Karen Scurry, P. E. FHWA Office of Safety Programs 609 -637 -4207 karen. scurry@dot. gov
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