CMF / CRF Details
CMF ID: 2375
Install curb and gutter
Description: Install AASHTO Type B curb along the outside (right) shoulder of four-lane suburban roadways.
Prior Condition: Suburban four-lane facilities without curb on the outside (right) shoulder. All roads have either two-way left-turn lanes or non-traversable medians.
Category: Shoulder treatments
Study: Collision Models for Multilane Highway Segments to Examine the Safety of Curbs, Baek and Hummer, 2008
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 110 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.89 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 11 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | All |
| Roadway Types: | Not Specified |
| Street Type: | |
| Minimum Number of Lanes: | 4 |
| Maximum Number of Lanes: | 4 |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | Divided by Median |
| Minimum Speed Limit: | 45 |
| Maximum Speed Limit: | 55 |
| Speed Unit: | mph |
| Speed Limit Comment: | |
| Area Type: | Suburban |
| Traffic Volume: | Minimum of 8333 to Maximum of 57138 |
| 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: | 2001 to 2003 |
| Municipality: | |
| State: | NC |
| Country: | |
| Type of Methodology Used: | Regression cross-section |
| Sample Size (crashes): | 2274 crashes |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Jan 01, 1970 |
| Comments: | |
