The Predictive Analysis application facilitates creating, managing, evaluating, and updating an agency’s Safety Performance Functions (SPFs) in an easily accessible interface.
Learn more about the Predictive Analysis application here.
Segments: Predictive Attributes
The following outlines West Virginia’s chosen predictive attributes used to generate Optimal Fit SPF groupings for segments:
Urban/Rural
Urban
Rural
Through Lanes
1
2
3
4
5
6
7
8
10
Functional Class
Local
Major Collector
Minor Arterial
Minor Collector
Other Freeways and Expressways
Other Principal Arterial
Interstate
Other
Requirements for Optimal Fit Creation
Minimum Crashes: 100
Minimum Segments: 50
Intersections: Predictive Attributes
The following outlines West Virginia’s chosen predictive attributes used to generate Optimal Fit SPF groupings for intersections:
Urban/Rural
Urban
Rural
Intersection Traffic Control
All-way stop
Other
Pedestrian Hybrid Beacon (PHB or High-Intensity Activated Crosswalk [HAWK])
RR crossing, crossbucks only
RR crossing, flashing lights only
RR crossing, gates, and flashing lights
RR crossing, stop-sign controlled
Signalized
Two-way stop
Uncontrolled
Yield sign
Flash Beacon (include Rectangular Rapid Flash Beacon)
Intersection Geometry
1 - T-intersection
2 - Y- intersection
3 - Cross-intersection (four legs)
4 - Five or more legs and not circular
5 - Roundabout
6 - Other circular intersection (e.g., rotaries, neighborhood traffic circles
7 - Midblock pedestrian
10 - Displaced left-turn (i.e., DLT, continuous flow, CFI) intersection
12 - Continuous green T intersection
13 - Quadrant (i.e., quadrant roadway) intersection
14 - Other
Requirements for Optimal Fit Creation
Minimum Crashes: 100
Minimum Segments: 50