A National County-Level Long Distance Travel Model Mike Chaney, AICP Tian Huang, PE, AICP, PTOE Binbin Chen, AICP 15 th TRB National Transportation Planning.

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Presentation transcript:

A National County-Level Long Distance Travel Model Mike Chaney, AICP Tian Huang, PE, AICP, PTOE Binbin Chen, AICP 15 th TRB National Transportation Planning Applications Conference May 19, 2015

Project Background ► Feasibility of extending the South Central High Speed Rail Corridor from Little Rock to Memphis, and improving the passenger rail corridor between Little Rock and Texarkana ► Alternatives Two possible routes Two levels of service (operating speed) alternatives –79 mph –110 mph

Project Location

Team ► Arkansas State Highway and Transportation Department (AHTD) FRA grant ► Alliance Transportation Group

Existing Tools ► FRA CONNECT Model MSA to MSA ► TSAM by Virginia Tech Four step model, at county level Auto, commercial air, passenger rail ► Texas Statewide Model (SAM) 5 state version ► Arkansas Statewide Model (AR TDM) Auto, Urban rail & bus, Freight (rail, truck, water, air)

Future Tools ► FHWA on-going efforts to model long distance travel A National Model System to Forecast Long Distance Passenger Travel Trips over 50 miles made by auto, air, rail or bus ► AASHTO – National Travel Demand Forecasting Model Phase I final scope - NCHRP report

Why Build a National County-Level Long Distance Model ► No readily available tool ► Data sources typically national ► A national model allows for the evaluation of alternative corridors ► It is reusable/transferable with little modification

Challenges in Building the Model ► Long distance travel survey data National datasets: –1995 ATS –2001 NHTS –2009 NHTS ► Networks AMTRAK network Air network Intercity bus network ► Schedule

Model Overview ► Trip is defined as trips over 100 miles, travels within the lower 48 states ► Zones: 3,076 counties in the lower 48 continental states of the US ► Networks: Highway network Multimodal Transit networks –Air –AMTRAK –Intercity bus –Potential rail routes

Model Overview – Flow Chart Trip Generation Party size models 1995 ATS W&P demographics CTPP Trip Distribution Trips are distributed by: party size, income and purpose 1995 ATS Mode Choice Trips are split into modes by party size and income and purpose Transit Assignment Transit trips are assigned to respective networks

Model Overview –Trip Generation ► Trip purpose: Business Non-business ► Trip rates: Data source: 1995 ATS By party size, household size, household income, and area type 10.1 long distance person round trips per household annually 22.8% business trips, 77.2% non-business trips

Model Overview – Party Size ► Party Size Model: Estimated from 1995 ATS for each trip purpose Binary choice between travel alone or travel in group Applied during trip generation

Model Overview – Trip Distribution ► Gravity model ► Impedance = Distance Average trip length (miles)

Model Overview – Mode Choice ► Alternatives: Auto Intercity rail Intercity bus High speed rail Air ► Level of service variables In-vehicle time Out-of-vehicle time Cost

Validation Data ► AMTRAK ridership AMTRAK provided ridership relevant to the study corridor AMTRAK fiscal year report ► Air ridership FAA domestic T-100 segment data ► Comparison are made for: System total By route By airport

Model Validation – Air and AMTRAK

Model Validation – AMTRAK

Model Validation – Key Airports

Project Status ► Stayed on Schedule ► Submitted Ridership to FRA ► Service Development Plan ► Alternative Analysis ► Highway Impacts

Works with Statewide Model ► Designed to work Arkansas Statewide Model Arkansas statewide model passenger trip purposes: –Short trip: less than 100 miles –Long distance trips: 100 miles or above, separated by business/non-business trips

Take Away ► Easily transferable ► Validated to AMTRAK ridership ► Potential Enhancements: Refine model when newer survey data is available Add special generators for tourist oriented areas Expand intercity bus network Backcast to 1995

Thank you Mike