CMF / CRF Details

CMF ID: 5051

Provide a raised median

Description:

Prior Condition: Two-way left-turn lane

Category: Access management

Study: Before-and-after safety study of roadways Where new medians have been added, Alluri et al., 2012

 
Star Quality Rating: 3 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.777
Adjusted Standard Error:
Unadjusted Standard Error: 0.051
Crash Reduction Factor (CRF)
Value: 22.3   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 5.1
Applicability
Crash Type: Rear end
Crash Severity: A (serious injury),B (minor injury),C (possible injury)
Roadway Types: Principal Arterial Other
Number of Lanes: 2,4,6
Road Division Type: Divided by TWLTL
Speed Limit:
Area Type: Urban and suburban
Traffic Volume: Minimum of 10500 to Maximum of 57000 Annual Average Daily Traffic (AADT)
Average Traffic Volume:
Time of Day: All
If countermeasure is intersection-based
Intersection Type:
Intersection Geometry:
Traffic Control:
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used: 2003 to 2010
Municipality:
State: FL
Country: USA
Type of Methodology Used: Simple before/after
Sample Size (crashes): 526 crashes before, 420 crashes after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Aug-01-2013
Comments: