CMF / CRF Details
CMF ID: 10240
Change from horizontal tangent to a sharp horizontal curve
Description: Change horizontal tangent to a curve with a radius less than 1,500 ft
Prior Condition: Horizontal tangent
Category: Alignment
Study: Development of crash modification factors of horizontal curve design features for single-motorcycle crashes on rural two-lane highways: A matched case-control study, Xin et al., 2019
Star Quality Rating: | [View score details] |
Rating Points Total: | 115 |
Crash Modification Factor (CMF) | |
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Value: | 4.92 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.88 |
Crash Reduction Factor (CRF) | |
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Value: | -392 (This value indicates an increase in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 88 |
Applicability | |
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Crash Type: | Other |
Crash Severity: | All |
Roadway Types: | Not specified |
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: | 15 |
Maximum Speed Limit: | 70 |
Speed Unit: | mph |
Speed Limit Comment: | |
Area Type: | Rural |
Traffic Volume: | Minimum of 10 to Maximum of 57000 Annual Average Daily Traffic (AADT) |
Average Traffic Volume: | 3600 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 | |
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Date Range of Data Used: | 2005 to 2015 |
Municipality: | |
State: | FL |
Country: | USA |
Type of Methodology Used: | Case-control |
Sample Size (crashes): | 1704 crashes |
Sample Size (miles): | 929 miles |
Sample Size (mile-years): | 10219 mile-years |