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A Data-Driven Method for Prioritizing Projects in Central Idaho. Prepared for the 2012 ITE Western District Meeting Santa Barbara, California. Prepared by Bob Schulte, DKS Associates June 2012. Presentation Outline. Development of Corridor Needs Assessment Tool

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slide1

A Data-Driven Method for Prioritizing Projects in Central Idaho

Prepared for the

2012 ITE Western District Meeting

Santa Barbara, California

Prepared by

Bob Schulte, DKS Associates

June 2012

presentation outline
Presentation Outline
  • Development of Corridor Needs Assessment Tool
  • Findings and Conclusions
  • Next Steps
need for assessment tool
Need for Assessment Tool
  • District 4 Needs
  • Support was needed for pre-STIP project development process
  • Dist. 4 had no structured, systematic method for needs identification
  • Method had to be practical, efficient, and sustainable
  • ITD Headquarters Requirements
  • Headquarters grades each district on on-time, on-budget project delivery performance
stip funding categories
STIP Funding Categories
  • Minor Pavement Preservation (1R)
  • Pavement Maintenance
  • Pavement Restoration
  • Bridge Preservation
  • Bridge Restoration
  • Expansion
  • Highway Safety Improvement
filtering factors
Filtering Factors
  • Filtering factors are applied prior to calculating need scores
  • Factors reflect minimum eligibility requirements within each funding program
  • Example – Minor Pavement Preservation Program
  • Pavement has not structurally failed, but is not in good structural condition
  • This means: 2.5 < Cracking Index < 3.5
identification of need score factors and weights
Identification of Need Score Factors and Weights
  • Factors needed to reflect:
  • Requirements from ITD Headquarters for project development
  • Factors considered by Dist. 4 in their project selection process
  • Weights:
  • Initial set of weights developed once factors defined
  • Weights revised based on Dist. 4 input
data sources
Data Sources
  • Example data sources:
    • Highway Data Quest (on-line roadway database)
    • Dist. 4 High Accident Location (HAL) listing
    • Traffic volume data from ITD Road Section
    • Bridge data from ITD Bridge Section
    • WebCARS (on-line crash records database)
  • Only new data developed was LOS data
system implementation
System Implementation

Corridor Needs Assessment Tool consists of two components:

  • Excel spreadsheets for calculating and reporting need scores
  • GIS shape files for graphically displaying levels of need for highway segments
need score map pavement preservation
Need Score Map -Pavement Preservation
  • Segments are color-coded by percentile need category
  • Gray segments are segments that do not meet filters
  • Maps allow quick first assessment of highest-need segments
  • Additional information can be obtained by “drilling down” into spreadsheets
findings and conclusions
Findings and Conclusions
  • Corridor Needs Assessment Tool:
    • Valuable first-cut method for identifying needs by funding category
    • Provides a systematic, defensible process for establishing project needs
  • Identified issues:
    • Data collection more labor-intensive than anticipated
    • Needs data is static and reflects existing conditions only
next steps
Next Steps
  • Short-term improvements:
  • Integration of Tool with ITD Transportation Asset Management System (TAMS)
  • Development of capability to produce future need scores
  • Long-term improvements:
  • Variable segmentation of highways for analysis
  • Linkage of Tool with needs-related databases
slide18

Bob Schulte

DKS Associates

TRANSPORTATION SOLUTIONS

720 SW Washington Street, Suite 500

Portland, Oregon  97205

Ph:  503.243.3500 |Cell:  503.504.9086 

rjs@dksassociates.com | www.dksassociates.com