CMF / CRF Details

CMF ID: 9656

Change intersection sight distance

Description:

Prior Condition:  Intersections with a base sight distance

Category: Intersection geometry

Study: Safety Evaluation of Geometric Design Criteria: Intersection Sight Distance at Unsignalized Intersections, Himes et al., 2018

 
Star Quality Rating:3 Stars  [View score details]
Rating Points Total:90
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:Other
Crash Severity:All
Roadway Types:All
Street Type:
Minimum Number of Lanes:2
Maximum Number of Lanes:4
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:All
Minimum Speed Limit:20
Maximum Speed Limit:70
Speed Unit:mph
Speed Limit Comment:
Area Type:All
Traffic Volume:
Average Traffic Volume:
Time of Day:All
If countermeasure is intersection-based
Intersection Type:Roadway/roadway (not interchange related)
Intersection Geometry:3-leg,4-leg
Traffic Control:Stop-controlled
Major Road Traffic Volume:Minimum of 272 to Maximum of 35671 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume:Minimum of 42 to Maximum of 15637 Annual Average Daily Traffic (AADT)
Average Major Road Volume :11395 Annual Average Daily Traffic (AADT)
Average Minor Road Volume :1317 Annual Average Daily Traffic (AADT)
Development Details
Date Range of Data Used:2008 to 2011
Municipality:
State:NC,OH,WA
Country:
Type of Methodology Used:Regression cross-section
Sample Size (crashes):1464 crashes
Sample Size (sites):832 sites
Sample Size (site-years):3328 site-years
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Oct 26, 2018
Comments:This CMF is for crashes that involve a vehicle on the major road colliding with vehicles from the minor road approach associated with the measured ISD. Due to the complexity of this CMFunction, the source paper contains graphs for ease of implementation.