CMF / CRF Details
CMF ID: 8490
Change in pavement roughness
Description: Effects of change in pavement roughness, often measured by International Roughness Index (IRI), on crashes
Prior Condition: International Roughness Index (IRI)=1.5m/km
Category: Roadway
Study: Investigation of the effect of pavement roughness on crash rates for rigid pavement, Elghriany et al., 2016
Star Quality Rating: | [View score details] |
Rating Points Total: | 80 |
Crash Modification Factor (CMF) | |
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Value: | 4.487 |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Crash Reduction Factor (CRF) | |
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Value: | -348.7 (This value indicates an increase in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Applicability | |
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Crash Type: | All |
Crash Severity: | All |
Roadway Types: | Principal Arterial Interstate |
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: | Divided by Median |
Minimum Speed Limit: | 60 |
Maximum Speed Limit: | 65 |
Speed Unit: | mph |
Speed Limit Comment: | |
Area Type: | Not specified |
Traffic Volume: | |
Average Traffic Volume: | |
Time of Day: | |
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: | 2001 to 2012 |
Municipality: | |
State: | OH |
Country: | USA |
Type of Methodology Used: | Regression cross-section |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Apr 10, 2017 |
Comments: | Increase IRI from 1.5m/km to 2.5m/km. |