CMF / CRF Details

CMF ID: 11026

Improve street lighting illuminance and uniformity

Description: Add or update street lighting to change the illuminance and uniformity along a roadway segment

Prior Condition: Average lighting level is [0 ft, 0.5fc]

Category: Highway lighting

Study: Development of crash modification factors for roadway illuminance: A matched case-control study, Li et al., 2021

Star Quality Rating: 4 Stars   [View score details]
Rating Points Total: 115
Crash Modification Factor (CMF)
Value: 0.679
Adjusted Standard Error:
Unadjusted Standard Error: 0.129
Crash Reduction Factor (CRF)
Value: 32.1   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 12.9
Crash Type: All
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 and suburban
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: 2011 to 2014
Municipality: Tampa
State: FL
Country: USA
Type of Methodology Used:
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Mar-16-2022
Comments: CMF of increasing the average lighting level from [0 fc, 0.5 fc] to (0.5 fc, 1.0 fc]