CMF / CRF Details

CMF ID: 5468

Landscape Medians at Intersections

Description: Landscape medians in form of ground cover, plant, or trees.

Prior Condition:  Tree setback from median nose is 100ft

Category: Access management

Study: Landscaping of Highway Medians at Intersections, Lin et al., 2013

Star Quality Rating:2 Stars  [View score details]
Rating Points Total:70
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:0.09
Crash Reduction Factor (CRF)
Value:18  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:9
Crash Type:All
Crash Severity:K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types:Principal Arterial Other Freeways and Expressways
Street Type:
Minimum Number of Lanes:2
Maximum Number of Lanes:6
Number of Lanes Direction:
Number of Lanes Comment:2, 4, and 6 Lanes
Crash Weather:Not specified
Road Division Type:Divided by Median
Minimum Speed Limit:30
Maximum Speed Limit:50
Speed Unit:mph
Speed Limit Comment:30 - 50 mph on Major Road / 15 - 30 mph on Minor Road
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:3-leg,4-leg
Traffic Control:Stop-controlled
Major Road Traffic Volume:Minimum of 4900 to Maximum of 49500 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:2009 to 2010
Type of Methodology Used:Regression cross-section
Sample Size (crashes):174 crashes
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Apr 30, 2014
Comments:The CMF represents the expected change in injury crashes when the tree setback from median nose is increased from 100ft to 200ft.