CMF / CRF Details

CMF ID: 9655

Flatten horizontal curve

Description:

Prior Condition:  Roadways with shaper horizontal curves

Category: Alignment

Study: A Before-After Evaluation of the Realignment of Horizontal Curves on Rural Two-Lane Roads, Srinivasan et al., 2018

 
Star Quality Rating:1 Star  [View score details]
Rating Points Total:30
Crash Modification Factor (CMF)
Value:Equation
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value:
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
Crash Type:All
Crash Severity:All
Roadway Types:All
Street Type:
Minimum Number of Lanes:2
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:Rural
Traffic Volume:Minimum of 400 to Maximum of 12000 Annual Average Daily Traffic (AADT)
Average Traffic Volume:3480 Annual Average Daily Traffic (AADT)
Time of Day:Not specified
If countermeasure is intersection-based
Intersection Type:
Intersection Geometry:
Traffic Control:
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:1997 to 2013
Municipality:
State:CA,NC,OH
Country:
Type of Methodology Used:Regression cross-section
Sample Size (sites):36 sites
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Oct 27, 2018
Comments:Central angle ranged from 1 to 117 and average increase in curve radius was 570 feet. Information on years of data were provided by the study author.