CMF / CRF Details

CMF ID: 7230

Provide on-ramp

Description: Presence of on-ramp

Prior Condition: No on-ramp present

Category: Access management

Study: NCHRP Report 794: Median Cross-Section Design for Rural Divided Highways, Graham et al., 2014

 
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Crash Modification Factor (CMF)
Value: 1.318
Adjusted Standard Error:
Unadjusted Standard Error: 0.28
Crash Reduction Factor (CRF)
Value: -31.82   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 27.99
Applicability
Crash Type: Cross median,Fixed object,Run off road,Other
Crash Severity: K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types: Principal Arterial Other Freeways and Expressways
Number of Lanes: 6
Road Division Type: Divided by Median
Speed Limit:
Area Type: Rural
Traffic Volume:
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: 2001 to 2005
Municipality:
State: OH
Country: USA
Type of Methodology Used: Regression cross-section
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Nov-01-2015
Comments: This CMF applies to the presence of an on-ramp for median-related crashes on six-lane freeways with flexible barriers. Median-related crashes include hit-barrier, cross-median, non-collision cross-median, rollover, fixed-object, and other median related crashes.