CMF / CRF Details
CMF ID: 10836
Change in pavement roughness
Description: Effects of change in pavement roughness, often measured by International Roughness Index (IRI), on crashes
Prior Condition: Existing pavement roughness as measured using Grip Number (GN).
Category: Roadway
Study: Crash Modification Functions for Pavement Surface Condition and Geometric Design Indicators, Cafiso et al., 2021
Star Quality Rating: | [View score details] |
Rating Points Total: | 100 |
Crash Modification Factor (CMF) | |
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Applicability | |
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Crash Type: | Wet road |
Crash Severity: | All |
Roadway Types: | Not specified |
Street Type: | |
Minimum Number of Lanes: | 2 |
Maximum Number of Lanes: | 2 |
Number of Lanes Direction: | |
Number of Lanes Comment: | |
Crash Weather: | Wet road |
Road Division Type: | |
Minimum Speed Limit: | 70 |
Maximum Speed Limit: | 90 |
Speed Unit: | km/h |
Speed Limit Comment: | |
Area Type: | Rural |
Traffic Volume: | Minimum of 449 to Maximum of 21313 Annual Average Daily Traffic (AADT) |
Average Traffic Volume: | 4900 Annual Average Daily Traffic (AADT) |
Time of Day: | All |
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Development Details | |
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Date Range of Data Used: | 2011 to 2017 |
Municipality: | |
State: | notusa |
Country: | Italy |
Type of Methodology Used: |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Aug 11, 2021 |
Comments: | Applies to two-lane rural secondary highways. |