CMF / CRF Details
CMF ID: 4677
Change length of deceleration lane from less than 100 ft. to 601-700 ft.
Description: Increase the length of an existing deceleration lane from less than 100 ft. to 601-700 ft.
Prior Condition: Deceleration lane length of less than 100 ft.
Category: Interchange design
Study: Selecting Optimal Deceleration Lane Lengths at Freeway Diverge Areas Combining Safety and Operational Effects, Chen, Zhou, and Lin, 2012
Image: View the countermeasure image.
Star Quality Rating: | [View score details] |
Rating Points Total: | 55 |
Crash Modification Factor (CMF) | |
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Value: | 0.016 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.014 |
Crash Reduction Factor (CRF) | |
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Value: | 98.41 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 1.4 |
Applicability | |
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Crash Type: | All |
Crash Severity: | All |
Roadway Types: | Principal Arterial Other Freeways and Expressways |
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: | |
Minimum Speed Limit: | |
Maximum Speed Limit: | |
Speed Unit: | |
Speed Limit Comment: | |
Area Type: | Not specified |
Traffic Volume: | |
Average Traffic Volume: | |
Time of Day: | Not specified |
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: | 2004 to 2006 |
Municipality: | |
State: | FL |
Country: | USA |
Type of Methodology Used: | Non-regression cross-section |
Sample Size (crashes): | 108 crashes |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | May 01, 2013 |
Comments: |