CMF / CRF Details
CMF ID: 7921
Increase pavement friction from F1 to F2
Description:
Increase pavement friction from F1 to F2
Prior Condition: Pavement friction F1
Category: Roadway
| Crash Modification Factor (CMF) |
|---|
| Value: |  |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Crash Reduction Factor (CRF) |
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| Value: |  |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Applicability |
|---|
| Crash Type: | Wet road |
| Crash Severity: | A (serious injury),B (minor injury),C (possible injury),O (property damage only) |
| Roadway Types: | Not specified |
| Street Type: | |
| Minimum Number of Lanes: | |
| Maximum Number of Lanes: | |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Wet road |
| 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: | Not specified |
| If countermeasure is intersection-based |
| Intersection Type: | Roadway/roadway (not interchange related) |
| Intersection Geometry: | 4-leg |
| Traffic Control: | Stop-controlled |
| Major Road Traffic Volume: | |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details |
|---|
| Date Range of Data Used: | 2010 to 2011 |
| Municipality: | Tehran |
| State: | notusa |
| Country: | Iran |
| Type of Methodology Used: | Regression cross-section |
| Sample Size (crashes): | 199 crashes |
| Sample Size (sites): | 32 sites |
| Sample Size (site-years): | 64 site-years |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Mar 08, 2016 |
| Comments: | CMF/CRF is calculated as the number of crashes per hundred million vehicles. |
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