CMF / CRF Details

CMF ID: 2758

Install median acceleration lane

Description: Install a median acceleration lane (MAL)

Prior Condition:  No Prior Condition(s)

Category: Intersection geometry

Study: NCHRP Report 650 - Median Intersection Design for Rural High-Speed Divided Highways, Maze et al., 2010

 
Star Quality Rating:1 Star  [View score details]
Rating Points Total:10
Crash Modification Factor (CMF)
Value:0.52
Adjusted Standard Error:
Unadjusted Standard Error:0.41
Crash Reduction Factor (CRF)
Value:48  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:40.6
Applicability
Crash Type:Angle
Crash Severity:All
Roadway Types:Principal Arterial Other Freeways and Expressways
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:Rural
Traffic Volume:
Average Traffic Volume:
Time of Day:All
If countermeasure is intersection-based
Intersection Type:Roadway/roadway (not interchange related)
Intersection Geometry:4-leg
Traffic Control:Stop-controlled
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:1993 to 2003
Municipality:Pettis County
State:MO
Country:USA
Type of Methodology Used:Simple before/after
Sample Size (crashes):9 crashes before, 2 crashes after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Mar 21, 2011
Comments:For far-side right angle crashes at 1 site.