CMF / CRF Details
CMF ID: 5409
Upgrade narrow unpaved shoulder (< 5 ft) to wide paved shoulder (> 5 ft)
Description: Upgrade narrow unpaved shoulder (< 5 ft) to wide paved shoulder (> 5 ft)
Prior Condition: Narrow ( < 5 ft) unpaved shoulder
Category: Shoulder treatments
Study: Evaluation of Safety Effectiveness of Composite Shoulders, Wide Unpaved Shoulders, and Wide Paved Shoulders in Kansas, Zeng et al., 2013
Star Quality Rating: | [View score details] |
Rating Points Total: | 85 |
Crash Modification Factor (CMF) | |
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Value: | 0.58 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.054 |
Crash Reduction Factor (CRF) | |
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Value: | 42 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 5.4 |
Applicability | |
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Crash Type: | All |
Crash Severity: | All |
Roadway Types: | Major Collector |
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: | Rural |
Traffic Volume: | Minimum of 65 to Maximum of 4950 Average Daily Traffic (ADT) |
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 | |
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Date Range of Data Used: | 2000 to 2009 |
Municipality: | |
State: | KS |
Country: | USA |
Type of Methodology Used: | Regression cross-section |
Sample Size (crashes): | 3135 crashes |