CMF / CRF Details

CMF ID: 10362

Install sequential dynamic chevrons

Description: Install sequential dynamic chevrons (SDC) that provide a sequential pattern of light emitting diodes (LEDs).

Prior Condition:  No Prior Condition(s)

Category: Signs

Study: Evaluation of Sequential Dynamic Chevrons on Rural Two-lane Highways, Hallmark, S., 2017

 
Star Quality Rating:3 Stars  [View score details]
Rating Points Total:105
Crash Modification Factor (CMF)
Value:0.4
Adjusted Standard Error:
Unadjusted Standard Error:0.085
Crash Reduction Factor (CRF)
Value:60  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:8.5
Applicability
Crash Type:Non-intersection
Crash Severity:K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types:Not specified
Street Type:
Minimum Number of Lanes:2
Maximum Number of Lanes:2
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Undivided
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
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:
Municipality:
State:CO,IA,MO,MT,TX,WA,WI
Country:
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Sample Size (crashes):28 crashes after
Sample Size (sites):18 sites before, 18 sites after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Mar 23, 2020
Comments: