CMF / CRF Details
CMF ID: 2839
Change bridge width (bridge minus roadway width) from X to Y
Description: Change bridge width (bridge minus roadway width) from X to Y ft
Prior Condition: No Prior Condition(s)
Category: Roadway
Study: Bridge Rail and Approach Railing for Low-Volume Roads in Iowa, Bigelow et al., 2010
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 115 |
| Crash Modification Factor (CMF) | |
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| Value: |  |
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| Unadjusted Standard Error: | |
| Crash Reduction Factor (CRF) | |
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| Value: |  |
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| Applicability | |
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| Crash Type: | All |
| Crash Severity: | All |
| Roadway Types: | |
| 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: | 45 |
| Maximum Speed Limit: | |
| Speed Unit: | mph |
| Speed Limit Comment: | > = 45 mph |
| Area Type: | |
| Traffic Volume: | |
| Average Traffic Volume: | 400 or less Annual Average Daily Traffic (AADT) |
| Time of Day: | All |
| 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 2008 |
| Municipality: | |
| State: | IA |
| Country: | USA |
| Type of Methodology Used: | Regression cross-section |
| Sample Size (crashes): | 341 crashes |
