iowa statewide travel demand model a status report paul hershkowitz wilbur smith associates dane...
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Iowa Statewide Travel Demand Model A Status Report
Paul HershkowitzWilbur Smith Associates
Dane IsmartThe Louis Berger Group
Mary LupaWilbur Smith Associates
Phil MescherIowa DOT, Office of Systems Planning
February 20, 2008
MTMUG Presentation
Purpose of Today’s Presentation
Review the two phases of the Iowa STM
Discuss the key purposes of the Iowa STM
Outline the findings of the architecture step
Provide a status report on key model elements (see next slide)
Obtain your feedback
Iowa STM Model Elements
Traffic Analysis Zones (Internal) geography
Buffer Zones (External) geography
Network
Socioeconomic Forecasts
Trucks
Phases I and II Work Flow
• Phase I developed the Iowa Statewide Model Framework for Phase II
Think “blueprint”
• Phase II is building the Iowa Statewide Model
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OMAHA
DES MOINES
CEDAR RAPIDS
DAVENPORT
SIOUX CITY
ROCHESTER
WATERLOO
IOWA CITY
DUBUQUE
LA CROSSE
AMES
MOLINE
QUINCY
GALESBURG
BELLEVUE
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IOWA
Phase II Work Flow
Two parts of Phase II:
Part 1 – Construction of Iowa STM using the Architecture “blueprint” (began October 15, 2007)
Part 2 – Commodity Flow Model Component (TBD)
Iowa DOT’s Actions supported the STM
• Assembled a team of internal and external transportation specialists
• Established a technical steering team – the EPSC – Executive Planning Steering Committee, which includes MPO representatives
• Set up a cooperative hands-on workshop program for TAZ, network, and centroid tasks with both DOT and consultant members
• Launched the effort formally in October 2007
Iowa STM Model ElementsApproach & Status
Traffic Analysis Zones (Internal) geography
Buffer Zones (External) geography
Network
Socioeconomic Forecasts
Trucks
Zone System Scales
A “telescoping” size approach to the zone systems is being used.
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Traffic Analysis Zones (Internal)- Before TAZ Aggregation
Traffic Analysis Zones (Internal) After TAZ Aggregation
Sample of Buffer and National Zone System (External)
“Buffer” Zones
Iowa Highway Network (Internal)
Network congruence is desired with the Iowa Road database - GIMS (Geographic Information Management System)
The Iowa DOT is reviewing the GIMS for connectivity, and assignability prior to formal network development
There is an opportunity to interface with the Iowa DOT LRS road file product under development in 2008.
Much work ahead of us.
Highway Network (External)
Begin with National Highway Network or FAF2.2 Highway network
Adjust to the buffer TAZ system with telescoping scale
Collect traffic counts at Iowa portals, both land and bridges.
Sample of Buffer and National Network (External)
Socioeconomic Forecasts
Data Sources Internal TAZ
Population - from 2000 Census with growth trends from REMI or Woods & Poole
Employment - from Iowa Workforce Development with growth trends from REMI or Woods & Poole
MPOs will assist the Iowa DOT on obtaining congruency of forecast totals in their areas
TAZs within Iowa will be scaled towards the micro size (small).
Population - from 2000 Census with growth trends from Woods & Poole
Employment - from Woods and Poole with growth trends from Woods & Poole
MPOs will provide SE data for the portions of MPOs outside of Iowa.
TAZs outside Iowa will be scaled larger than those within the state.
Data Sources External TAZ
REMI in Iowa
• Used statewide since 1991
• Custom developed by REMI on fixed Iowa districts
• Contains population & total employment
• 1990 to 2050 by one-year increments
• Run by the Office of Program Management in the Planning, Programming and Modal Division
• Used by Iowa DOT for two highway corridor studies: US 63 from Waterloo to the Twin Cities US 20 from Fort Dodge to Sioux City
Current REMI Districts
• Five Des Moines counties individually (yellow)
• Eight MPO counties as a unit (green)
• Remainder of Iowa (gray)
SE Challenge
• REMI estimates are locally derived providing the best overall fit to Iowa conditions
• How to solve the “eight in one” city/county problem?
Sioux City, Council Bluffs, Ames, Waterloo, Cedar Rapids, Iowa City, Dubuque and Davenport are forecast as a group.
Iowa Truck Flows
Estimated Iowa Daily Truck Traffic
Source: FHWA
Iowa Total Domestic Truck Flows
Source: FHWA
Trucks
Iowa DOT wanted the most recent national and state data
The new Freight Analysis Framework (FAF2) freight data will be used for national truck flow information to/from and through Iowa.
FAF2 Districts
Comments and
Questions?