CMF / CRF Details
CMF ID: 4977
Convert a 2 ft. turf shoulder to a 10 ft. composite shoulder (first 3 ft. bituminous with remainder aggregate)
Description: Convert a 2 ft. turf shoulder to a 10 ft. composite shoulder (first 3 ft. bituminous with remainder aggregate)
Prior Condition: 2 ft. paved 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
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 85 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 1.06 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.051 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | -6 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 5.1 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | All |
| 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: | 3352 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): | 2269 crashes |
