CMF / CRF Details
CMF ID: 2442
Increase freeway on-ramp density from 0 to 5 ramps per mile
Description: The ramp density is the number of on-ramps per mile (total in both directions).
Prior Condition: No Prior Condition(s)
Category: Access management
Study: Evaluating the Effects of Freeway Design Elements on Safety, Park, Fitzpatrick, Lord, 2010
Star Quality Rating: | [View score details] |
Rating Points Total: | 110 |
Crash Modification Factor (CMF) | |
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Value: | 1.279 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.12 |
Crash Reduction Factor (CRF) | |
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Value: | -27.9 (This value indicates an increase in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 12.2 |
Applicability | |
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Crash Type: | All |
Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
Roadway Types: | Principal Arterial Other Freeways and Expressways |
Street Type: | |
Minimum Number of Lanes: | 8 |
Maximum Number of Lanes: | 8 |
Number of Lanes Direction: | |
Number of Lanes Comment: | |
Crash Weather: | Not specified |
Road Division Type: | Divided by Median |
Minimum Speed Limit: | |
Maximum Speed Limit: | |
Speed Unit: | |
Speed Limit Comment: | |
Area Type: | Urban |
Traffic Volume: | |
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: | 1997 to 2001 |
Municipality: | |
State: | TX |
Country: | |
Type of Methodology Used: | Regression cross-section |
Sample Size (crashes): | 4019 crashes |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Jan 01, 1970 |
Comments: |