CMF / CRF Details
Decrease paved outside shoulder width from 10ft to 8ft
Countermeasure ID: 5506
Description: Decrease paved outside shoulder width from 10ft to 8ft
Prior Condition: 10 ft paved outside shoulder width
Category: Shoulder treatments
Study: Using multivariate adaptive regression splines (MARS) to develop crash modification factors for urban freeway interchange influence areas, Haleem et al., 2013
| Crash Modification Factor (CMF) |
|---|
| Value: | 1.081 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.131 |
| Crash Reduction Factor (CRF) |
|---|
| Value: | -8.1 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 13.1 |
| Applicability |
|---|
| Crash Type: | All |
| Crash Severity: | All |
| Roadway Types: | Principal Arterial Other Freeways and Expressways |
| Street Type: | |
| Minimum Number of Lanes: | 4 |
| Maximum Number of Lanes: | |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | 4 - 6+ Lanes |
| Crash Weather: | Not specified |
| Road Division Type: | Divided by Median |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Urban |
| Traffic Volume: | Minimum of 5700 to Maximum of 309000 Annual Average Daily Traffic (AADT) |
| Average Traffic Volume: | 95338 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 |
|---|
| Date Range of Data Used: | 2007 to 2010 |
| Municipality: | |
| State: | FL |
| Country: | USA |
| Type of Methodology Used: | Regression cross-section |
| Sample Size (crashes): | 40008 crashes |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Apr 30, 2014 |
| Comments: | CMF for urban freeway interchange areas |
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