Download - 2011 TrafficMفقشببodeling MikeBjordahl 2
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Overview of Travel Demand Modeling at WSDOT ER Planning
Mike BjordahlTransportation Engineer
WSDOT Eastern Region Planning Office
18th Annual Northwest Tribal Transportation Symposium
April 20, 2011
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“Th li t f t ti ti th t I id th t i 1975 I d ’t k h I“The same list of statistics that I saw said that in 1975—I don’t know why I should be bothering about that year, except that I have grandchildren—said there are going to be 80 million automobiles on our streets and roads and highways ”and highways.
President Eisenhower, 1954
http://www.fhwa.dot.gov/interstate/audiotext.htm#cadillac
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http://www.fhwa.dot.gov/policyinformation/statistics/2009/pdf/dv1c.pdf
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http://www.fhwa.dot.gov/policyinformation/statistics/2009/pdf/dv1c.pdf
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Metropolitan Planning Organization (MPO)S k R i l T t ti C il (SRTC)Spokane Regional Transportation Council (SRTC)
Federally Mandated: 1962 Federal Legislation 50,000+ Population Region Wide 3 C’s: Continuing, Cooperative, and Comprehensive Supply us with the regional model
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Travel Demand Modelingg
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Travel Demand Modelingg
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Travel Demand Modeling
THE FOUR STEP MODEL1. TRIP GENERATION2. TRIP DISTRIBUTION3. MODE CHOICE4. TRIP ASSIGNMENT
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Trip Generationp
House Trip Gen: 2 Home Based Work (HBW) and 2 Home Based School (HBS)
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Trip GenerationT t ti A l i Z (TAZ)Transportation Analysis Zone (TAZ)
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Trip Generationp
Productions/Origins Attractions/DestinationsProductions/Origins Attractions/Destinations
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Trip Distributionp
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Mode Choice
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Mode Choice
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Mode Choice
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Trip Assignmentp g
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Trip Assignment“Flow Bundle”Flow Bundle
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North Spokane Corridorp
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North Spokane Corridor
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North Spokane CorridorU d C t tiUnder Construction
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VISUM Difference Network showing Predicted Shift from North/South Local Arterials to the NSC/
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Link Volume toLink Volume to Capacity Ratios
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Node Volume to Capacity Ratiosp y
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2005
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2010
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Turn Volumes
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Model to Count Comparison
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Post ProcessingNCHRP 255 Methodology
Factoring Procedures for Turning Movements
ff Difference
Ratio
Combined
If Needed, Engineering Judgment
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SourcesBeimborn, Edward A. A Transportation Modeling Primer. 1995
Transportation Research Board. NCHRP 255 ‐ Highway Traffic Data for Urbanized Area Project Planning and Design 1982Project Planning and Design. 1982
PTV America, Inc. PTV Vision – Tutorial Four‐Step Demand Modeling with VISUM. Corvallis, OR, 2007
Travel Model Improvement Program (http://tmip.fhwa.dot.gov/)Travel Model Improvement Program (http://tmip.fhwa.dot.gov/)