CMF / CRF Details

CMF ID: 10265

Install dynamic speed feedback sign

Description: System consisting of a speed measuring device and a message sign that displays feedback to those drivers who exceed a predetermined threshold. It may be the actual speed, a message such as SLOW DOWN, or activation of a warning device, such as beacons or a curve warning sign

Prior Condition:  No dynamic speed feedback sign present

Category: Advanced technology and ITS

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:1 Star  [View score details]
Rating Points Total:25
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:0.29
Crash Reduction Factor (CRF)
Value:22  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:29
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:
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
Date Range of Data Used:2010 to 2017
Municipality:FDOT District 7
Type of Methodology Used:
Sample Size (crashes):22 crashes before, 13 crashes after
Sample Size (sites):11 sites before, 11 sites after
Sample Size (site-years):33 site-years before, 33 site-years after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Dec 07, 2019
Comments:This CMF applies to lane departure and roadway departure motorcycle crashes on horizontal curves.