CMF / CRF Details

CMF ID: 8200

Provide a raised median

Description:

Prior Condition: Median type grass, single or double-yellow line, painted double double yellow median, two-way left-turn lane, auxiliary left-turn lane, or median opening

Category: Access management

Study: Safety Analysis of Driveway Characteristics along Major Urban Arterial Corridors in South Carolina, Stokes et al., 2016

 
Star Quality Rating: 3 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.49
Adjusted Standard Error:
Unadjusted Standard Error: 0.16
Crash Reduction Factor (CRF)
Value: 51 (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 16
Applicability
Crash Type: Other
Crash Severity: All
Roadway Types: Not specified
Number of Lanes:
Road Division Type: All
Speed Limit:
Area Type: Urban
Traffic Volume:
Time of Day: Not specified
If countermeasure is intersection-based
Intersection Type:
Intersection Geometry:
Traffic Control:
Major Road Traffic Volume:
Minor Road Traffic Volume:
Development Details
Date Range of Data Used: 2012 to 2012
Municipality:
State: SC
Country: USA
Type of Methodology Used: Regression cross-section
Sample Size (sites): 3774 sites
Sample Size (site-years): 3774 site-years
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Jan-17-2017
Comments: Applies to driveway-related crashes. Rectangular buffer areas used, extending across all travel lanes for full access driveways and to the roadway centerline for right-in right-out driveways.

[View the Full Study Details]

The information contained in the Crash Modification Factors (CMF) Clearinghouse is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for the use of the information contained in the CMF Clearinghouse. The information contained in the CMF Clearinghouse does not constitute a standard, specification, or regulation, nor is it a substitute for sound engineering judgment.