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(%) Quality Crash Type Crash Severity Roadway Type Area Type
0.65 35 3 Stars All All Not specified Urban
0.26 74 3 Stars All A,B,C Not specified Urban

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

CMF CRF(%) Quality Crash Type Crash Severity Roadway Type Area Type
0.95 5 3 Stars All All Not specified Urban

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

CMF CRF(%) Quality Crash Type Crash Severity Roadway Type Area Type
0.28 72 4 Stars All All Not specified Urban
0.42 58 4 Stars All All Not specified Rural
0.12 88 4 Stars All A,B,C Not specified Urban
0.18 82 4 Stars All A,B,C Not specified Rural