CMF / CRF Details
CMF ID: 11750
Improve street lighting illuminance and uniformity
Description:
Add or update street lighting to change the illuminance and uniformity along a roadway segment
Prior Condition: Lighting fluctuation frequency above 30 per mile given average illuminance is below 0.6 fc
Category: Highway lighting
Crash Modification Factor (CMF) |
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Value: | 0.82 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.09 |
Crash Reduction Factor (CRF) |
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Value: | 18 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | |
Applicability |
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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 |
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 |
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Date Range of Data Used: | 2018 to 2022 |
Municipality: | |
State: | UT |
Country: | USA |
Type of Methodology Used: | |
Other Details |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | May 07, 2025 |
Comments: | CMF for decreasing lighting fluctuation frequency from above to below 30 per mile given an average illuminance below 0.6 fc. This CMF was developed from a dataset with only Urban Arterial roadway segments located in Salt Lake and Utah counties in Utah. Please take this into consideration when using the CMF for other roadway types and/or in other jurisdictions. |