Countermeasures - stc.utk.edu

Countermeasures - stc.utk.edu

COUNTERMEASURES Copyright 2016 STC, UK Rational vs. Pragmatic Analysis Rational Data and analysis Pragmatic

Lay beliefs Factual experience Personal anecdotal experience Meeting standards means safe

Estimates based on the effect on safety Regression-to-the-Mean (RTM) Mean Source: FHWA

High Risk Sites Priority/emphasis areas Political will Funding sources Data-driven High risk sites

High Risk Site Identification (1/2) Crash numbers Crash rates Critical rate High Risk Site Identification

HSM procedures SPFs Comparable sites (2/2) High Risk Site Details Crash Factors

Human Roadway Vehicle Environmental Collision Type Run-off Road Rear End

Head On Sideswipe Same Direction Why Need Countermeasures? Economic efficiency Professional and institutional responsibility Fairness

Review Methods Engineering studies Road Safety Audits Road Safety Audit Reviews Safety improvements

NCHRP 500 Series Guidebooks Countermeasures That Work Proven Safety Countermeasures

Roundabouts

Corridor access management Back-plates and retro-reflective borders Longitudinal rumble strips and stripes on 2lane roads Enhanced delineation and friction on horizontal curves Safety edges Medians and pedestrian crossing islands in urban and suburban areas Pedestrian hybrid beacon Road diets

Crash Modification Factors Measure of safety effectiveness of a treatment or element CMF>1 Increase CMF<1 Decrease CMF specific applications Crash type Crash severity CMF Weaknesses Isolating specific treatments or populations Time

Money Multiple treatment CMFs CMF Clearinghouse www.cmfclearinghouse.org Known CMFs Star rated

Countermeasure CostsBenefits Costs Initial investment Ongoing maintenance costs Project life-cycle Benefits

Safety benefits Non-safety benefits Indirect benefits Qualitative Considerations Design standards Tradeoffs Familiarity

Constituent concerns Post-Implementation Evaluation Countermeasure effectiveness Scientific evaluation

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