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CE 552 Week 11

CE 552 Week 11. Identification of problem areas - High crash locations – critical rate method Engineering site studies needed. High Crash Location Methods. Frequency Rate Severity/Cost Some combination Iowa DOT uses .2F+.2R+.6C Critical Rate Factor method Empirical Bayes

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CE 552 Week 11

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  1. CE 552 Week 11 Identification of problem areas - High crash locations – critical rate method Engineering site studies needed

  2. High Crash Location Methods • Frequency • Rate • Severity/Cost • Some combination • Iowa DOT uses .2F+.2R+.6C • Critical Rate Factor method • Empirical Bayes • Full (Heirarchical) Bayes • Iowa DOT doing research on this

  3. Critical Crash Rate Factor method Error: this should say Z, not S For derivation of equation and interpretation of terms, see link

  4. Next step: engineering study at sites

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