CMF / CRF Details

CMF ID: 517

Active work with temporary 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
Crash Modification Factor (CMF)
Value: 1.65
Adjusted Standard Error:
Unadjusted Standard Error: 0.08
Crash Reduction Factor (CRF)
Value: -65   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 8
Applicability
Crash Type: Nighttime
Crash Severity: All
Roadway Types: Principal Arterial Other Freeways and Expressways
Number of Lanes:
Road Division Type:
Speed Limit:
Area Type: Not specified
Traffic Volume: Minimum of 100000 Annual Average Daily Traffic (AADT)
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: