CMF / CRF Details
CMF ID: 9763
Install edgeline or shoulder rumble strips
Description:
Prior Condition: Two-lane undivided highway with no edgeline or shoulder rumble strips present
Category: Roadway
Study: Installation Guidance for Centerline and Edgeline Rumble Strips in Narrow Pavements, Savolainen et al., 2017
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 115 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.839 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.065 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 16.1 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 6.5 |
| Applicability | |
|---|---|
| Crash Type: | Other |
| 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: | Undivided |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Not specified |
| Traffic Volume: | Minimum of 10 to Maximum of 17700 Annual Average Daily Traffic (AADT) |
| Average Traffic Volume: | 2428 Annual Average Daily Traffic (AADT) |
| 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: | 2014 to 2015 |
| Municipality: | |
| State: | IA |
| Country: | United States |
| Type of Methodology Used: | Regression cross-section |
| Sample Size (crashes): | 1022 crashes |
| Sample Size (sites): | 13948 sites |
| Sample Size (site-years): | 27896 site-years |
| Sample Size (miles): | 5439.7 miles |
| Sample Size (mile-years): | 10879.4 mile-years |
