CMF / CRF Details

CMF ID: 7780

Install lighting

Description:

Prior Condition: Roadways without street lighting

Category: Highway lighting

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

 
Star Quality Rating: 4 Stars   [View score details]
Rating Points Total: 120
Crash Modification Factor (CMF)
Value: 0.72
Adjusted Standard Error:
Unadjusted Standard Error: 0.08
Crash Reduction Factor (CRF)
Value: 28   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 8
Applicability
Crash Type: Other
Crash Severity: All
Roadway Types: All
Number of Lanes:
Road Division Type: All
Speed Limit:
Area Type: All
Traffic Volume:
Average Traffic Volume:
Time of Day: Night
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: 2006 to 2010
Municipality:
State: FL
Country: USA
Type of Methodology Used: 2
Sample Size (sites): 45 sites before, 45 sites after
Sample Size (site-years): 135 site-years before, 90 site-years after
Sample Size (miles): 131.7 miles before, 131.7 miles after
Sample Size (miles): 395 mile-years before, 263 mile-years after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Mar-08-2016
Comments: CMFs of other crash types adding lighting on all roads types with all number of lanes. Here other crash types include all types of crash except rear-end, angle, and single vehicle crashes. 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.