CMF / CRF Details

CMF ID: 8479

Improve lighting


Prior Condition:  Illuminance ≥ 0.2 fc and < 1.1 fc

Category: Highway lighting

Study: Safety Effects of Street Illuminance at Urban Signalized Intersections in Florida, Wei et al., 2016

Star Quality Rating:3 Stars  [View score details]
Rating Points Total:75
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value:-15.8  (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type:Other
Crash Severity:All
Roadway Types:Not specified
Street Type:
Minimum Number of Lanes:
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Urban
Traffic Volume:
Average Traffic Volume:
Time of Day:All
If countermeasure is intersection-based
Intersection Type:Roadway/roadway (not interchange related)
Intersection Geometry:3-leg,4-leg
Traffic Control:Signalized
Major Road Traffic Volume:Minimum of 5167 to Maximum of 67508 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume:Minimum of 1300 to Maximum of 56387 Annual Average Daily Traffic (AADT)
Average Major Road Volume :29733 Annual Average Daily Traffic (AADT)
Average Minor Road Volume :12457 Annual Average Daily Traffic (AADT)
Development Details
Date Range of Data Used:2010 to 2013
Type of Methodology Used:Regression cross-section
Sample Size (crashes):1234 crashes
Sample Size (sites):91 sites
Sample Size (site-years):364 site-years
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Jan 17, 2017
Comments:CMF applies for increasing illuminance from medium (≥ 0.2 fc to < 1.1 fc) to high (≥1.1 fc)