CMF / CRF Details
Lower posted speed from 60 km/h to 50 km/h
Countermeasure ID: 10983
Description:
Prior Condition: Posted speed limit of 60 km/h
Category: Speed management
Study: Development of Crash Modification Factors for Intersections in Toowoomba city, Al-Marafi et al., 2020
| Crash Modification Factor (CMF) |
|---|
| Value: | 0.68 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.015 |
| Crash Reduction Factor (CRF) |
|---|
| Value: | 32 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 1.5 |
| Applicability |
|---|
| Crash Type: | All |
| Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
| Roadway Types: | All |
| Street Type: | |
| Minimum Number of Lanes: | 2 |
| Maximum Number of Lanes: | 5 |
| 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: | All |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | All |
| If countermeasure is intersection-based |
| Intersection Type: | Roadway/roadway (not interchange related) |
| Intersection Geometry: | 3-leg,4-leg |
| Traffic Control: | Other |
| Major Road Traffic Volume: | Minimum of 4500 to Maximum of 21784 Annual Average Daily Traffic (AADT) |
| Minor Road Traffic Volume: | Minimum of 1600 to Maximum of 14837 Annual Average Daily Traffic (AADT) |
| Average Major Road Volume : | 12546 Annual Average Daily Traffic (AADT) |
| Average Minor Road Volume : | 5769 Annual Average Daily Traffic (AADT) |
| Development Details |
|---|
| Date Range of Data Used: | 2008 to 2015 |
| Municipality: | Toowoomba city |
| State: | notusa |
| Country: | Australia |
| Type of Methodology Used: | |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Aug 11, 2021 |
| Comments: | Intersections are a combination of signalized and un-signalized. |
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