CMF / CRF Details

CMF ID: 10260

Change from horizontal tangent to a moderate horizontal curve

Description: Change horizontal tangent to a curve with a radius between 1,500 ft and 3,000 ft

Prior Condition: Horizontal tangent or horizontal curve with a radius greater than 10,000 feet

Category: Alignment

Study: Study on Motorcycle Safety in Negotiation with Horizontal Curves in Florida and Development of Crash Modification Factors, Wang et al., 2018

Star Quality Rating: 3 Stars   [View score details]
Rating Points Total: 90
Crash Modification Factor (CMF)
Value: 2.98
Adjusted Standard Error:
Unadjusted Standard Error: 0.44
Crash Reduction Factor (CRF)
Value: -198   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 44
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:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type: Rural
Traffic Volume: Minimum of 460 to Maximum of 25180 Annual Average Daily Traffic (AADT)
Average Traffic Volume: 4269 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
Date Range of Data Used: 2005 to 2015
State: FL
Country: USA
Type of Methodology Used:
Sample Size (crashes): 439 crashes
Sample Size (miles): 561 miles
Sample Size (mile-years): 6168 mile-years
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-07-2019
Comments: This CMF applies to motorcycle-involved crashes. A moderate horizontal curve is defined as a curve with a radius between 1000 feet and 2000 feet.