Study Details

Study Title: Observational Before-After Study of the Safety Effect of U.S. Roundabout Conversions Using the Empirical Bayes Method

Authors: Persaud et al.

Publication Date: 2001

Abstract:

Study Citation: Persaud, B. N., Retting, R. A., Garder, P. E., and Lord, D., "Observational Before-After Study of the Safety Effect of U.S. Roundabout Conversions Using the Empirical Bayes Method." Transportation Research Record, No. 1751, Washington, D.C., Transportation Research Board, National Research Council, (2001)


CMFs Associated With This Study

Category: Intersection geometry

Countermeasure: Conversion of signalized intersection into single- or multi-lane roundabout

CMF CRF(%)QualityCrash TypeCrash SeverityRoadway TypeArea Type
0.65354 StarsAllAllNot specifiedUrban
0.26744 StarsAllA,B,CNot specifiedUrban

Countermeasure: Conversion of stop-controlled intersection into multi-lane roundabout

CMF CRF(%)QualityCrash TypeCrash SeverityRoadway TypeArea Type
0.9554 StarsAllAllNot specifiedUrban

Countermeasure: Conversion of stop-controlled intersection into single-lane roundabout

CMF CRF(%)QualityCrash TypeCrash SeverityRoadway TypeArea Type
0.28724 StarsAllAllNot specifiedUrban
0.42584 StarsAllAllNot specifiedRural
0.12884 StarsAllA,B,CNot specifiedUrban
0.18824 StarsAllA,B,CNot specifiedRural