CMF / CRF Details

CMF ID: 10555

Install ramp meter

Description: Install a ramp meter signal at the on-ramp to enhance mainline throughput and reduce system-wide delay.

Prior Condition:  No Prior Condition(s)

Category: Advanced technology and ITS

Study: Developing Florida-specific Mobility Enhancement Factors (MEFs) and Crash Modification Factors (CMFs) for TSM&O Strategies, Alluri et al., 2020

Star Quality Rating:3 Stars  [View score details]
Rating Points Total:85
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value:41  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type:All
Crash Severity:All
Roadway Types:Principal Arterial Interstate
Street Type:
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Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Divided by Median
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Urban
Traffic Volume:
Average Traffic Volume:
Time of Day:
If countermeasure is intersection-based
Intersection Type:
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Traffic Control:
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Minor Road Traffic Volume:
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Development Details
Date Range of Data Used:2016 to 2018
Municipality:Miami-Dade County
Type of Methodology Used:Case-control
Sample Size (crashes):493 crashes
Sample Size (miles):10 miles
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Dec 17, 2020
Comments:Safety benefit of ramp metering system between operational vs non-operational