1. Engineering site studies needed
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

7. Next step: engineering study at sites