CMF / CRF Details

CMF ID: 523

Active work with no lane closure (compared to no work zone)

Description:

Prior Condition:  No Prior Condition(s)

Category: Work zone

Study: Traffic Safety Evaluation of Daytime and Nighttime Work Zones, Ullman et al., 2008

 
Star Quality Rating:4 Stars  [View score details]
Rating Points Total:110
Crash Modification Factor (CMF)
Value:1.34
Adjusted Standard Error:
Unadjusted Standard Error:0.34
Crash Reduction Factor (CRF)
Value:-34  (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:34
Applicability
Crash Type:Nighttime
Crash Severity:A (serious injury),B (minor injury),C (possible injury)
Roadway Types:Principal Arterial Other Freeways and Expressways
Street Type:
Minimum Number of Lanes:
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Not specified
Traffic Volume:
Average Traffic Volume:
Time of Day:
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:
Country:
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Dec 01, 2009
Comments: