dTIMS Benefits Analysis: An Iowa DOT Case Study

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dTIMS Benefits AnalysisAn Iowa DOT Case Study

• 10th Deighton User Conference
• Omar Smadi
• Center for Transportation Research and Education
• Iowa STATE University

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Presentation Outline

• Overview
• dTIMS Setup
• dTIMS Data
• Quantifying Benefits
• Results
• Iowa Pavement Management Program (IPMP)

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Overview

• Iowa DOT Started with dTIMS is 1996 for
  Interstate System
• 5-year rehabilitation program using dTIMS
  recommendations since 1998
• Primary System setup has been completed this year

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Overview

• dTIMS Users
• Office of Design Setup and Interstate Analysis
• Office of Program Management 5-year needs
• Office of Systems Planning Short and long term
  needs
• Office of Maintenance 3R program (Interstate and
  Primary systems)
• District Offices 5-year construction program
  (Primary System)

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dTIMS Setup

• Generate Strategies 5 years
• Analysis Period 50 years
• Optimization Area under the curve
• Committed Treatment Flag
• ON for DOT Analysis
• OFF for dTIMS Analysis

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dTIMS Setup

• Treatment Strategies 12
• Functional Overlay (Thickness, milling?)
• Structural Overlay (Thickness, milling?)
• Replacement
• Performance Curves 4
• PCI
• IRI
• Rutting
• Structure

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dTIMS Setup

• Analysis Set (dTIMS)

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dTIMS Setup

• Analysis Set (DOT)

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dTIMS Data

• Use 1992 Condition Information
• PCI
• IRI
• Rutting
• Structure
• Commit treatments using the Iowa DOT Construction
  History from (1992 to 1996)

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dTIMS Data (Condition)
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dTIMS Data (Treatments)
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Quantifying Benefits

• Average PCI Using DOT Construction Program
• Average PCI Using dTIMS Recommendations for
  Benefit Maximization
• Average PCI Using dTIMS Recommendations for Cost
  Effectiveness Maximization

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Average PCI Using the Iowa DOT Program (Committed)
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Average PCI Using dTIMS Recommendation (Benefits)
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Average PCI Using dTIMS Recommendation (Cost Eff.)
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PCI Comparison
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Results

• DOT Average PCI 74
• dTIMS (Benefits) PCI 76.5
• dTIMS (Cost Eff.) PCI 78
• Total Budget 175 Millions over 5 years

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Results

• dTIMS Investment Analysis
• Benefits
• Cost Effectiveness

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Investment Analysis Using dTIMS (Benefits)
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Investment Analysis Using dTIMS (Cost Eff.)
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Iowa Pavement Management Program (IPMP)
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IPMP Mission

• Support of the MANAGEMENT, PLANNING, and
  PROGRAMMING needs of transportation agencies
• Provide pavement management information, tools,
  and training supporting both PROJECT level and
  NETWORK level activities

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IPMP

• ISTEA Mandate (1991)
• Started in 1995
• 38,000 KM
• State, Counties and Cities
• Three Phase approach

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MAJOR TASKS

• Database Design
• Pavement Management Data
• Pavement Management Software
• Information Delivery
• Training
• Implementation

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Data Assimilation
Condition
History
Cartography Inventory
GIS Database
Dynamic Segmentation
Summarized Condition Data
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Summary
Condition
PCC
ACC
ACC
History
Dynamic Segmentation
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IPMP DATA DELIVERY
AutoCAD DWG/DXF
MicroStation
Graphics Only
MicroStation DGN
AutoCAD
Graphics and Data
MGE MicroStation Oracle
MapInfo TAB
Access
ODBC
dBase DBF
MapInfo
ArcView
ArcView SHP
GeoMedia Pro
Excel,123
GeoMedia Web Map
ArcExplorer
GeoMedia
Data Only
(Free)
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Ongoing Tasks

• Database Maintenance and Update
• Graphics
• Inventory data
• History data
• Condition Data Collection
• Data collection contract
• Technology evaluation
• Data Delivery
• dTIMS Setup and Training
• System Evaluation

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Future Tasks

• PMS Software Distribution (continue)
• Training
• General
• GIS
• PMS Software
• System Evaluation and Update

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QUESTIONS