CMF / CRF Details

CMF ID: 5232

Presence of an elevated road above intersection

Description: Intersection location is below an elevated roadway

Prior Condition:  No Prior Condition(s)

Category: Intersection geometry

Study: Corridor-level signalized intersection safety analysis in Shanghai, China using Bayesian hierarchal models, Kun Xie, Xuesong Wang, Helai Huang, Xiahong Chen, 2013

Star Quality Rating:3 Stars  [View score details]
Rating Points Total:80
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:0.32
Crash Reduction Factor (CRF)
Value:-58  (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:31.9
Crash Type:All
Crash Severity:All
Roadway Types:Not specified
Street Type:
Minimum Number of Lanes:
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Urban
Traffic Volume:
Average Traffic Volume:
Time of Day:Not specified
If countermeasure is intersection-based
Intersection Type:Roadway/roadway (not interchange related)
Intersection Geometry:3-leg,4-leg
Traffic Control:Signalized
Major Road Traffic Volume:Minimum of 7700 to Maximum of 140300 Average Daily Traffic (ADT)
Minor Road Traffic Volume:
Average Major Road Volume :46200 Average Daily Traffic (ADT)
Average Minor Road Volume :
Development Details
Date Range of Data Used:2009 to 2009
Type of Methodology Used:Regression cross-section
Sample Size (site-years):195 site-years
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Dec 02, 2013
Comments:Major road volumes are actually total entering traffic