CMF / CRF Details
CMF ID: 9653
Flatten horizontal curve
Description:
Prior Condition: Roadways with shaper horizontal curves
Category: Alignment
Study: A Before-After Evaluation of the Realignment of Horizontal Curves on Rural Two-Lane Roads, Srinivasan et al., 2018
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 110 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.584 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.176 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 41.6 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 17.6 |
| Applicability | |
|---|---|
| Crash Type: | Other |
| Crash Severity: | All |
| Roadway Types: | All |
| 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: | Minimum of 400 to Maximum of 12000 Annual Average Daily Traffic (AADT) |
| Average Traffic Volume: | 3480 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: | 1997 to 2013 |
| Municipality: | |
| State: | CA,NC,OH |
| Country: | |
| Type of Methodology Used: | Before/after using comparison group |
| Sample Size (crashes): | 61 crashes before, 13 crashes after |
| Sample Size (sites): | 39 sites before, 39 sites after |
| Sample Size (site-years): | 220 site-years before, 130 site-years after |
