CMF / CRF Details

CMF ID: 4028

Change roundabout intersection sight distance from X to Y

Description: Changing roundabout intersection sight distance from X to Y. Refer to the study for descriptions of roundabout sight distances.

Prior Condition: Roundabout with intersection sight distance X

Category: Intersection geometry

Study: The Influence of Driver Sight Distance on Crash rates and Driver Speed at Modern roundabouts in the United States, Angelastro, 2010

 
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Crash Modification Factor (CMF)
Value: Equation
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value: Equation
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
Crash Type: Run off road
Crash Severity: All
Roadway Types: Not Specified
Number of Lanes:
Road Division Type:
Speed Limit:
Area Type:
Traffic Volume:
Average Traffic Volume:
Time of Day: Not specified
If countermeasure is intersection-based
Intersection Type:
Intersection Geometry: Not specified
Traffic Control:
Major Road Traffic Volume: Minimum of 434 to Maximum of 7300 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:
Municipality:
State:
Country:
Type of Methodology Used: Regression cross-section
Sample Size (sites): 26 sites
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Jun-04-2012
Comments: Note: CMF applies only to loss of control crashes