CMF / CRF Details

CMF ID: 8799

Install raised median with or without marked crosswalk (uncontrolled)


Prior Condition:  No median

Category: Pedestrians

Study: Development of Crash Modification Factors for Uncontrolled Pedestrian Crossing Treatments, Zegeer et al., 2017

Star Quality Rating:4 Stars  [View score details]
Rating Points Total:115
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:0.183
Crash Reduction Factor (CRF)
Value:31.5  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:18.3
Crash Type:Vehicle/pedestrian
Crash Severity:All
Roadway Types:Minor Arterial
Street Type:
Minimum Number of Lanes:2
Maximum Number of Lanes:8
Number of Lanes Direction:
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 and suburban
Traffic Volume:Minimum of 1245 to Maximum of 46000 Annual Average Daily Traffic (AADT)
Average Traffic Volume:12599 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:2004 to 2013
Type of Methodology Used:Meta-analysis
Sample Size (crashes):6 crashes before, 13 crashes after
Sample Size (sites):68 sites before, 68 sites after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Nov 17, 2017
Comments:Methodology used was a combination of EB before-after and cross-sectional estimations. Also, study sites were a combination of intersection and mid-block locations.