CMF / CRF Details
Install median barrier
Countermeasure ID: 7019
Description:
Prior Condition: No median barrier present
Category: Roadside
Study: NCHRP Report 794: Median Cross-Section Design for Rural Divided Highways, Graham et al., 2014
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 80 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 3.25 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.106 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | -225 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 10.55 |
| Applicability | |
|---|---|
| Crash Type: | Cross median,Fixed object,Run off road,Other |
| Crash Severity: | All |
| Roadway Types: | Principal Arterial Other Freeways and Expressways |
| 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: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Rural |
| Traffic Volume: | |
| 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 2007 |
| Municipality: | |
| State: | MO,NC,OH |
| Country: | USA |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (sites): | 302 sites before, 302 sites after |
