CMF / CRF Details
CMF ID: 11685
Increase speed limit from 55 mph to 60 mph
Description:
Prior Condition: Two-lane rural roads with 55 mph speed limit
Category: Speed management
Study: Speed Limit Change (55 mph to 60 mph) Safety Re-Evaluation, Saleem et al., 2023
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 147 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 1.152 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.04 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | -15.2 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 4 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | K (fatal), A (serious injury), B (minor injury) |
| Roadway Types: | Principal Arterial Other |
| Street Type: | Two-Way |
| Minimum Number of Lanes: | 2 |
| Maximum Number of Lanes: | 2 |
| Number of Lanes Direction: | Both Directions |
| Number of Lanes Comment: | |
| Crash Weather: | All |
| Road Division Type: | Undivided |
| Minimum Speed Limit: | 55 |
| Maximum Speed Limit: | 55 |
| Speed Unit: | mph |
| Speed Limit Comment: | |
| Area Type: | Rural |
| Traffic Volume: | |
| Average Traffic Volume: | 3136.83 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: | 2012 to 2022 |
| Municipality: | |
| State: | MN |
| Country: | USA |
| Type of Methodology Used: | |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Sep 18, 2024 |
| Comments: | This CMF is presented in Table 9 in the report. |
