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 Idaho’s chosen predictive attributes used to generate Optimal Fit SPF groupings for segments:
Functional Class
Interstate
Local
Major Collector
Minor Arterial
Minor Collector
Principal Arterial - Other
Principal Arterial - Other Freeways or Expressways
Urban/Rural
Rural
Small Urban
Urban
Number of Lanes
1
1.5
2
2.5
3
3.5
4
4.5
5
6
10
Requirements for Optimal Fit Creation
Minimum Crashes: 100
Minimum Segments: 50