CMF / CRF Details

CMF ID: 4027

Change roundabout circulating sight distance from X to Y

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

Prior Condition:  Roundabout with circulating 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

 
Star Quality Rating:2 Stars  [View score details]
Rating Points Total:60
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:All
Crash Severity:All
Roadway Types:Not Specified
Street Type:
Minimum Number of Lanes:
Maximum Number of Lanes:
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:Not specified
Traffic Volume:
Average Traffic Volume:
Time of Day:Not specified
If countermeasure is intersection-based
Intersection Type:Roadway/roadway (not interchange related)
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: