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)
Value: 0.685
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
State: AZ, FL, IL, MA, NY, NC, OR, VA, WI
Country: USA
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.