CMF / CRF Details

CMF ID: 4264

Convert signalized intersection to modern roundabout

Description:

Prior Condition:  Signalized intersection

Category: Intersection geometry

Study: Evaluation of Safety Strategies at Signalized Intersections, Srinivasan, et al., 2011

 
Star Quality Rating:4 Stars  [View score details]
Rating Points Total:120
Crash Modification Factor (CMF)
Value:0.759
Adjusted Standard Error:
Unadjusted Standard Error:0.052
Crash Reduction Factor (CRF)
Value:24.1  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:5.2
Applicability
Crash Type:All
Crash Severity:All
Roadway Types:Not specified
Street Type:
Minimum Number of Lanes:1
Maximum Number of Lanes:2
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Urban and suburban
Traffic Volume:
Average Traffic Volume:
Time of Day:Not specified
If countermeasure is intersection-based
Intersection Type:Roadway/roadway (not interchange related)
Intersection Geometry:4-leg
Traffic Control:Roundabout
Major Road Traffic Volume:Minimum of 5322 to Maximum of 43123 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume:
Average Major Road Volume :18529 Annual Average Daily Traffic (AADT)
Average Minor Road Volume :
Development Details
Date Range of Data Used:1999 to 2009
Municipality:
State:CO,FL,IN,MD,MI,NY,NC,SC,VT,WA
Country:USA
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Sample Size (sites):22 sites after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Dec 06, 2012
Comments:Countermeasure name has been slightly modified for consistency across Clearinghouse