CMF / CRF Details

CMF ID: 535

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


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: 130
Crash Modification Factor (CMF)
Value: 1.67
Adjusted Standard Error: 0.23
Unadjusted Standard Error: 0.19
Crash Reduction Factor (CRF)
Value: -67   (This value indicates an increase in crashes)
Adjusted Standard Error: 23
Unadjusted Standard Error: 19
Crash Type: Nighttime
Crash Severity: O (property damage only)
Roadway Types: Principal Arterial Other Freeways and Expressways
Number of Lanes:
Road Division Type:
Speed Limit:
Area Type: Not specified
Traffic Volume: Minimum of All to Maximum of All
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:
Type of Methodology Used: 2
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-01-2009