CMF / CRF Details

CMF ID: 11139

Coordinated Ramp Metering

Description:

Prior Condition:  Ramp without ramp metering

Category: Advanced technology and ITS

Study: Before-After Safety Evaluation of Coordinated Ramp Metering System using Empirical Bayes Approach: A Case Study on I-80 in California, Amirarsalan Mehrara Molan, Anurag Pande, and Stuart Madison Harvey, 2022

 
Star Quality Rating:3 Stars  [View score details]
Rating Points Total:85
Crash Modification Factor (CMF)
Value:1.12
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value:-12  (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
Crash Type:All
Crash Severity:O (property damage only)
Roadway Types:Principal Arterial Interstate
Street Type:Two-Way
Minimum Number of Lanes:8
Maximum Number of Lanes:10
Number of Lanes Direction:Both Directions
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:Not specified
Traffic Volume:
Average Traffic Volume:187173 Annual Average Daily Traffic (AADT)
Time of Day:Not specified
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:2012 to 2019
Municipality:
State:CA
Country:
Type of Methodology Used:
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Aug 25, 2022
Comments:This is the CMF for the entire corridor PDO crashes.