CMF / CRF Details

CMF ID: 4259

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]
Crash Modification Factor (CMF)
Value: 0.259
Adjusted Standard Error:
Unadjusted Standard Error: 0.066
Crash Reduction Factor (CRF)
Value: 74.1   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 6.6
Applicability
Crash Type: All
Crash Severity: K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types: Not specified
Number of Lanes: 1 to 2
Road Division Type:
Speed Limit:
Area Type: 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: 3-leg,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): 15 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