CMF / CRF Details

CMF ID: 5622

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


Prior Condition:  Roadways with no workzone

Category: Work zone

Study: Estimating the Impact of Work Zones on Highway Safety, Ozturk et al., 2014

Star Quality Rating:3 Stars  [View score details]
Rating Points Total:105
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:0.023
Crash Reduction Factor (CRF)
Value:-16.8  (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:2.3
Crash Type:All
Crash Severity:All
Roadway Types:All
Street Type:
Minimum Number of Lanes:2
Maximum Number of Lanes:4
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:
Minimum Speed Limit:35
Maximum Speed Limit:65
Speed Unit:mph
Speed Limit Comment:
Area Type:All
Traffic Volume:Minimum of 8396 to Maximum of 70447 Annual Average Daily Traffic (AADT)
Average Traffic Volume:33974 Annual Average Daily Traffic (AADT)
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 2011
Type of Methodology Used:Regression cross-section
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Aug 12, 2014
Comments:CMF is based on the comparison of monthly crash counts between pre- and during work zone conditions