CMF / CRF Details

CMF ID: 4119

Provide split phases

Description: The regular 2 phases of a cycle are split into three phases. Pedestrians receive a "walk" display while the parallel traffic that would normally turn left or right through the crosswalk is held with a left or right red arrow signal and the through movement proceeds on a green signal. After the pedestrian crossing is completed, a red "steady hand" is displayed and the turns are then made on a green arrow signal while the through movement continues to move. Split phase requires dedicated turn lanes since through and turning movements are governed by different signal indications.

Prior Condition:  The regular two phases of a traffic cycle are split into three phases. Pedestrians receive a "walk" display while the parallel traffic that would normally turn left or right through the crosswalk is held with a left or right red arrow and the through movement proceeds on a green signal. After the pedestrian crossing is completed, a red "steady hand" is displayed and the turns are then made on a green arrow signal while the through movement continues to move.

Category: Intersection traffic control

Study: The Relative Effectiveness of Pedestrian Safety Countermeasures at Urban Intersections - Lessons from a New York City Experience, Li Chen, Cynthia Chen, and Reid Ewing, 2012

Image: View the countermeasure image.

 
Star Quality Rating:2 Stars  [View score details]
Rating Points Total:60
Crash Modification Factor (CMF)
Value:0.61
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value:39  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
Crash Type:Vehicle/pedestrian
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:All
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Urban
Traffic Volume:
Average Traffic Volume:
Time of Day:All
If countermeasure is intersection-based
Intersection Type:Roadway/roadway (not interchange related)
Intersection Geometry:4-leg
Traffic Control:Signalized
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:1998 to 2008
Municipality:New York City
State:NY
Country:USA
Type of Methodology Used:Simple before/after
Sample Size (crashes):212 crashes before, 52 crashes after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Nov 01, 2012
Comments:The major road operates under one-way traffic flow. The corresponding change in crashes in the comparison group was an 8 percent reduction in pedestrian-vehicle crashes. This could be used to adjust the treatment effect to account for other factors not related to the treatment.