Practice question

An agency conducts an Empirical Bayes (EB) analysis at a location and finds the expected crash frequency is 12 crashes per year, while the SPF prediction for similar sites is 8 crashes per year. What does this indicate?

  1. The location is performing as expected
  2. The location has a potential for safety improvement (PSI) because expected crashes exceed the predicted norm
  3. The SPF is miscalibrated and should be discarded
  4. The crash data at this location is unreliable

Answer: B — The location has a potential for safety improvement (PSI) because expected crashes exceed the predicted norm

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