CMF / CRF Details

CMF ID: 4026

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: 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]
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: Rear end
Crash Severity: All
Roadway Types: Not Specified
Number of Lanes:
Road Division Type: All
Speed Limit:
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: Note: This CMF applies to ENTRY rear-end crashes