CMF / CRF Details
Convert a 2 ft. turf shoulder to a 6 ft. turf shoulder
Countermeasure ID: 5018
Description: Convert a 2 ft. turf shoulder to a 6 ft. turf shoulder
Prior Condition: 2 ft. turf shoulder.
Category: Shoulder treatments
Study: Safety Effectiveness of Various Types of Shoulders on Rural Two-Lane Roads in Winter and Non-Winter Periods, Zeng and Schrock, 2013
| Crash Modification Factor (CMF) |
|---|
| Value: | 0.64 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.082 |
| Crash Reduction Factor (CRF) |
|---|
| Value: | 36 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 8.2 |
| Applicability |
|---|
| Crash Type: | All |
| Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
| 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: | Not specified |
| Road Division Type: | |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Rural |
| Traffic Volume: | |
| Average Traffic Volume: | 875 Annual Average Daily Traffic (AADT) |
| Time of Day: | Not specified |
| 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: | 2003 to 2007 |
| Municipality: | |
| State: | KS |
| Country: | USA |
| Type of Methodology Used: | Regression cross-section |
| Sample Size (crashes): | 143 crashes |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Aug 01, 2013 |
| Comments: | CMF is significant at the 0.05 level. |
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