CMF / CRF Details
CMF ID: 9044
Raise posted speed
Description:
Prior Condition: No Prior Condition(s)
Category: Speed management
Study: Evaluating the safety impact of increased speed limits on rural highways in British Columbia, Tarek Sayed, Emanuele Sacchi, 2016
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 130 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 1.111 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.009 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | -11.1 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.9 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
| Roadway Types: | Principal Arterial Other |
| Street Type: | |
| Minimum Number of Lanes: | |
| Maximum Number of Lanes: | |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | All |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Rural |
| Traffic Volume: | |
| Average Traffic Volume: | 11246 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 2015 |
| Municipality: | |
| State: | |
| Country: | Canada |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 1212 crashes before, 848 crashes after |
| Sample Size (miles): | 812 miles before, 812 miles after |
| Sample Size (miles): | 1897 mile-years before, 1083 mile-years after |
