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)
Value: 1.158
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
Municipality: Tampa
State: FL
Country: USA
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)