Liyang Feng

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Explore Detroit Region Trip Chaining Behavior

• Presented by
• Liyang Feng Jilan Chen
• Southeast Michigan Council of Governments
• The 12th TRB Transportation Planning Applications
  Conference
• Houston, TX
• May 17-21, 2009

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SEMCOG Region in 2005

• Seven counties Wayne, Washtenaw, Oakland,
  Macomb, Livingston, St. Clair, and Monroe
• Employment 2.16 millions
• Population 4.83 millions
• Households 1.85 millions Population
• Estimated week day vehicle trips 18.0 millions
• Regional VMT 137.5 millions

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Challenges in SEMCOG Region

• Declining manufactory industry
• Higher unemployment rate (7.6 vs. 11.6)
• Declining housing market
• Declining regional travel

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Manufacturing Employment
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Total Wage/Salary Employment
(-341,300, or -14.2)
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Regional VMT 2002-2008

• Average daily VMT reduced 8.6
• Average weekday traffic reduced 7.5
• 2007-2008 average traffic reduced 2.7
• Traffic declined more over the weekends

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2005 Regional Travel Survey

• Part of the Michigan statewide travel behavior
  data collection effort.
• Covered SEMCOG seven county region
• 6,000 HHs plus 600 transit oriented HHs surveyed
• Activity based survey for future needs
• Completed in mid-2005

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Survey Data Applications

• Support current modeling needs
• refresh existing travel models (E5 version)
• Improve transit and mode choice models (E6
  version)
• Provide regional travel behavior snapshot
• Prepare for future ABM development

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Prepare for Activity Based Modeling

• Explore general travel characteristics
• Explore trip chaining characteristics
• How Detroit region differs from other metro area

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Trip and Tour Definition

• Three basic trip definition HBW, HBO, NHB
• Tour definition Tour, Sub Tour
• Primary mode of tour
• Primary destination

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Tour Pattern
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1
Home
Eat Meal
Work
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7
6
4
5
Social
Shop
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Mode and Destination

• Primary mode School bus, Park Ride, W-Transit,
  Drive alone, Shared 2/3, Bike, Walk, Other
• Primary destination decision tree includes
  place, activity and time

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Analysis Reference

• Reference data provided by DRCOG
• Denver Regional 1996 TBI Activity based survey
  with 4,166 HHs plus 667 transit focused HHs
• Different in population, area size and
  employment, and industries
• Similar in survey design

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Analysis Reference (cont.)

• Different Regions
• population 4.8 m Vs. 1.8 m
• Households 2.0 m Vs. 0.9 m
• industries
• Similar in survey design

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Data Processing

• Maintained similar variable definition
• Maintained same tour and sub-tour definition
• Adopted same primary mode of tour and primary
  destination definition logic.

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Number of Trips Per Tour
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Location of Primary Destination
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Activity at Primary Destination
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Primary Mode of Tour
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Duration of Primary Activity
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Starting Place and Primary Destination
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Initial Findings

• Two regions are almost identical on the
  distribution of primary mode of tour, and the
  distribution of number of trips per tour
• Activities at primary destination are similar
  except for work activities. Detroit region has
  lower than Denver region
• Duration of activities show a different
  distribution

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ABM Implications

• Transferable model parameters
• More efficient surveys
• More efficient model development process
• Common platforms

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Next Steps

• Explore and compare other travel characteristics
  in the regions, such as primary activities and
  number of trips distribution, temporal
  distribution of tours and activities
• Compare 2005 survey to SEMCOG 1994 HH survey.

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Thank You Very Much ?