CMF / CRF Details

CMF ID: 10232

Change posted speed limit from X MPH to Y MPH

Description: Change the posted speed limit from X miles per hour to Y miles per hour

Prior Condition:  Posted speed limit of X MPH

Category: Speed management

Study: Estimation of bicycle crash modification factors (CMFs) on urban facilities using zero inflated negative binomial models, Raihan et al., 2019

 
Star Quality Rating:3 Stars  [View score details]
Rating Points Total:105
Crash Modification Factor (CMF)
Value:Equation
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value:Equation
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
Crash Type:Vehicle/bicycle
Crash Severity:All
Roadway Types:Not specified
Street Type:
Minimum Number of Lanes:6
Maximum Number of Lanes:6
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Divided by Median
Minimum Speed Limit:40
Maximum Speed Limit:55
Speed Unit:mph
Speed Limit Comment:
Area Type:Urban
Traffic Volume:Minimum of 8000 to Maximum of 98500 Annual Average Daily Traffic (AADT)
Average Traffic Volume:42703 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:2011 to 2014
Municipality:
State:FL
Country:USA
Type of Methodology Used:Regression cross-section
Sample Size (crashes):1283 crashes
Sample Size (miles):783 miles
Sample Size (mile-years):3132 mile-years
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Dec 07, 2019
Comments:This CMF applies to vehicle/bicycle crashes on urban six-lane divided segments when average lane width is less than 12 feet. Posted speed limit ranges from 40 to 55 MPH.