Engineering site studies needed

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Presentation transcript:

Engineering site studies needed 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 Full (Heirarchical) Bayes Iowa DOT doing research on this

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

Next step: engineering study at sites