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]
Crash Modification Factor (CMF)
Value: 0.82
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
Number of Lanes: 2,4,6
Road Division Type: Divided by Median
Speed Limit: 30 to 50 mph on major road and 15 to 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
State: FL
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.