CMF / CRF Details

CMF ID: 2808

Install dynamic advance intersection warning system

Description: Install dynamic advance intesrection warning signs to provide real-time traffic condition (VEHICLES ENTERING WHEN FLASHING).

Prior Condition:  No Prior Condition(s)

Category: Advanced technology and ITS

Study: NCHRP Report 650 - Median Intersection Design for Rural High-Speed Divided Highways, Maze et al., 2010

Star Quality Rating:1 Star  [View score details]
Rating Points Total:30
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:0.11
Crash Reduction Factor (CRF)
Value:70  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:10.6
Crash Type:All
Crash Severity:All
Roadway Types:Principal Arterial Other Freeways and Expressways
Street Type:
Minimum Number of Lanes:4
Maximum Number of Lanes:4
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Divided by Median
Minimum Speed Limit:55
Maximum Speed Limit:55
Speed Unit:mph
Speed Limit Comment:
Area Type:Rural
Traffic Volume:
Average Traffic Volume:
Time of Day:All
If countermeasure is intersection-based
Intersection Type:Roadway/roadway (not interchange related)
Intersection Geometry:4-leg
Traffic Control:Stop-controlled
Major Road Traffic Volume:Minimum of 7700 to Maximum of 10100 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:1990 to 2004
Municipality:Columbus County
Type of Methodology Used:Simple before/after
Sample Size (crashes):35 crashes before, 14 crashes after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Mar 21, 2011
Comments:For 1 site. Double yellow centerline and median stop bars were installed in the after period; these treatments may contribute to a decrease in some crashes.