CMF / CRF Details

CMF ID: 326

Install a traffic signal

Description:

Prior Condition: No Prior Condition(s)

Category: Intersection traffic control

Study: Accident Modification Factors for Traffic Engineering and ITS Improvements, Harkey et al., 2008

 
Star Quality Rating: 5 Stars
Crash Modification Factor (CMF)
Value: 0.23
Adjusted Standard Error: 0.02
Unadjusted Standard Error: 0.02
Crash Reduction Factor (CRF)
Value: 77   (This value indicates a decrease in crashes)
Adjusted Standard Error: 2
Unadjusted Standard Error: 2
Applicability
Crash Type: Angle
Crash Severity: All
Roadway Types: Not Specified
Number of Lanes:
Road Division Type:
Speed Limit:
Area Type: Rural
Traffic Volume:
Average Traffic Volume:
Time of Day:
If countermeasure is intersection-based
Intersection Type: Roadway/roadway (not interchange related)
Intersection Geometry: 3-leg,4-leg
Traffic Control: Stop-controlled
Major Road Traffic Volume: Minimum of 3261 to Maximum of 29926 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume: Minimum of 101 to Maximum of 10300 Annual Average Daily Traffic (AADT)
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? Yes. HSM lists this CMF in bold font to indicate that it has the highest reliability since it has an adjusted standard error of 0.1 or less.
Date Added to Clearinghouse: Dec-01-2009
Comments: Countermeasure name changed to match HSM