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: 2 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.78
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
Applicability
Crash Type: Other
Crash Severity: All
Roadway Types: Not specified
Number of Lanes: 2
Road Division Type: Undivided
Speed Limit:
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
State: FL
Country: USA
Type of Methodology Used: Before/after using comparison group
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.