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AltaViz –
GDOT’s Alternative Visualization Analysis Tool for the
Atlanta Managed Lane System Plan
February 25, 2011Atlanta Model User Group Meeting
Jennifer Zhan, AICPTom Hutchinson, AICP
GDOT’s Managed Lane System Plan Respond to transportation needs
which have outpaced traditional revenue sources
Provide a valuable and reliable mobility option, in spite of congestion
Lead and tackle policy and implementation issues
Unite managed lane investments into a comprehensive “system plan” framework
Key Technical Elements
Traffic and revenue analysis
Conceptual design and cost estimation
Financial feasibility analysis
Traffic and Revenue Analysis
Eligibility Policy (Cars vs. Trucks)
Occupancy Policy (HOT2+, HOT3+, HOT4+ vs. ETL)
Lane Method (Laneage, General Purpose Lane Conversion)
Bi-directional vs. Reversible Full Access vs. Optimized Access Financial Policy (Maximum revenue vs. Maximum
efficiency)
Revenue Risk Factors
Delayed vs. Base vs. Accelerated Growth Willingness to Pay (Cars): Lower – Base- Higher Willingness to Pay (Trucks): Lower – Base- Higher Alternate/Competing Transportation investments Transit Frequency HOV Formation Rates General Purpose Lane Speed
Conceptual Design and Cost Estimation
Lane Method (Laneage, General Purpose Lane Conversion)
Bi-directional vs. Reversible Full Access vs. Optimized Access Barrier vs. Buffer At Grade vs. Elevated (E/S side vs. W/N side vs. Median)
Full Reconstruction vs. Overlay Design Exceptions
Financial Feasibility Analysis Inputs
– Revenue streams– Capital costs for corridors and interchanges
Parameters– Capital Structure Type– Financial Term– Opening Year for Traffic– Interest Rate
Outputs– Capital distribution– Net Present Value of public sector outflows (GAP)
PARAMETERSBond RatesInternal Rate of ReturnFinancing TermDebt Service Coverage RatioSenior and Junior DebtDiscount Rate
PARAMETERSBond RatesInternal Rate of ReturnFinancing TermDebt Service Coverage RatioSenior and Junior DebtDiscount Rate
INPUTS
OUTPUTS
Net Present Value of Public Sector Outflow (GAP)
Capital Distribution
Revenue Stream
Capital Cost Estimates
Revenue Ramp-Up
Key Drivers and FactorsREVENUE DRIVERS
HOT2+, HOT3+, HOT4+ vs. ETL vs. METL vs. TOT
Maximum revenue vs. Maximum efficiency
Reversible vs. Bi-Directional
GP Lanes Remain vs. GP Lane Conversion
Laneage
Full Access vs. Optimized Access
REVENUE RISK FACTORS
Delayed vs. Base vs. Accelerated Growth
Willingness to Pay (Cars): Lower – Base- Higher
Willingness to Pay (Trucks): Lower – Base- Higher
Transit Frequency
Alternate/Competing Transportation investments
HOV Formation Rates
General Purpose Lane Speed
COST DRIVERS
System Termini
Reversible vs. Bi-Directional
At Grade vs. Elevated
Elevated: East/South side vs. West/North side vs. Median
Laneage
Barrier vs. Buffer
Full Reconstruction vs. Overlay
GP Lanes Remain vs. GP Lane Conversion
Full Access vs. Optimized Access
Design Exceptions
FINANCIAL PARAMETERS
Capital Structure Type
Financial Term
Opening Year for Traffic
Interest Rate for current interest bond
TIFIA Loan Interest Rate
Developer Required IRR
Facility Operation and Maintenance
Toll Collection Operation and Maintenance
> 1,000,000 data points
AltaViz – Alternative Visualization Analysis Tool
Consolidate a wealth of data
Efficient communication of results
Ability to perform side-by-side comparison of alternatives