CMF / CRF Details

CMF ID: 1993

Modify signal phasing (implement a leading pedestrian interval)

Description:

Prior Condition: Signalized intersection with pedestrian signal heads. Avg ped volume per day ranged from about 100 to 1000 peds.

Category: Intersection traffic control

Study: Safety Effectiveness of Leading Pedestrian Intervals Using the Empirical Bayes Method, Fayish and Gross, 2009

 
Star Quality Rating: 3 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.413
Adjusted Standard Error:
Unadjusted Standard Error: 0.064
Crash Reduction Factor (CRF)
Value: 58.7   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 6.4
Applicability
Crash Type: Vehicle/pedestrian
Crash Severity: All
Roadway Types: Principal Arterial Other
Number of Lanes: 4
Road Division Type:
Speed Limit: 25
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: 3-leg,4-leg
Traffic Control: Signalized
Major Road Traffic Volume: Minimum of 12000 to Maximum of 13500 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used: 1989 to 2007
Municipality: State College
State: PA
Country:
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Sample Size (crashes): 24 crashes before, 14 crashes after
Sample Size (sites): 10 sites before, 10 sites after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-01-2009
Comments: Pedestrian crossing volumes reached nearly 1,000 pedestrians per hour per crosswalk during peak periods because of class schedules at the university, but pedestrian volumes were much smaller during off-peak times.