CMF / CRF Details

CMF ID: 7850

Install a traffic signal

Description:

Prior Condition: Stop-Controlled Intersections

Category: Intersection traffic control

Study: Validation and Application of Highway Safety Manual (Part D) in Florida, Abdel-Aty et al., 2014

 
Star Quality Rating: 2 Stars   [View score details]
Rating Points Total: 65
Crash Modification Factor (CMF)
Value: 0.71
Adjusted Standard Error:
Unadjusted Standard Error: 0.13
Crash Reduction Factor (CRF)
Value: 29   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 13
Applicability
Crash Type: Rear end
Crash Severity: All
Roadway Types: Not specified
Number of Lanes:
Road Division Type:
Speed Limit:
Area Type: Urban
Traffic Volume:
Average Traffic Volume:
Time of Day: All
If countermeasure is intersection-based
Intersection Type: Not specified
Intersection Geometry: 4-leg
Traffic Control: Stop-controlled
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used: 2005 to 2009
Municipality:
State: FL
Country: USA
Type of Methodology Used: 1
Sample Size (sites): 9 sites before, 9 sites after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Mar-08-2016
Comments: The number of crashes in the after period were not reported in this study, however, they have been recorded as 300 to give 10 points as a beneift of doubt for one or more of the following: (1) number of miles/sites in the reference/treatment group, (2) number of crashes in the references/treatment group, (3) reporting AADTs for the aggregate dataset but not for the disaggragate dataset used for CMF development.