CMF / CRF Details

CMF ID: 5467

Landscape Medians at Intersections

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

Prior Condition: Medians with trees compliant with Florida’s design standards

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: 3.26
Adjusted Standard Error:
Unadjusted Standard Error: 2.22
Crash Reduction Factor (CRF)
Value: -226   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 222
Applicability
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
Municipality:
State: FL
Country:
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 for medians without trees compared to medians with trees compliant with Florida’s design standards. The state's design elements include tree setback, tree diameter, tree spacing, tree canopy, and ground cover.