CMF / CRF Details
CMF ID: 5409
Upgrade narrow unpaved shoulder (< 5 ft) to wide paved shoulder (> 5 ft)
Description:
Upgrade narrow unpaved shoulder (< 5 ft) to wide paved shoulder (> 5 ft)
Prior Condition: Narrow ( < 5 ft) unpaved shoulder
Category: Shoulder treatments
| Crash Modification Factor (CMF) |
|---|
| Value: | 0.58 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.054 |
| Crash Reduction Factor (CRF) |
|---|
| Value: | 42 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 5.4 |
| Applicability |
|---|
| Crash Type: | All |
| Crash Severity: | All |
| Roadway Types: | Major Collector |
| Street Type: | |
| Minimum Number of Lanes: | 2 |
| Maximum Number of Lanes: | 2 |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | Undivided |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Rural |
| Traffic Volume: | Minimum of 65 to Maximum of 4950 Average Daily Traffic (ADT) |
| Average Traffic Volume: | |
| 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: | 2000 to 2009 |
| Municipality: | |
| State: | KS |
| Country: | USA |
| Type of Methodology Used: | Regression cross-section |
| Sample Size (crashes): | 3135 crashes |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Jan 09, 2014 |
| Comments: | The cross sectional model compares narrow unpaved shoulders to wide paved shoulders. There are more crashes included in the sample, specifically associated with the category "wide paved shoulders," that wasn't included in the summary statistics. |
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