Transcript Integration of Transportation System Analyses in Cube Wade L. White, AICP Citilabs Inc

Integration of Transportation System
Analyses in Cube
Wade L. White, AICP
Citilabs Inc
A comprehensive transportation
planning system
 Cube has two parts:
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Cube Base: the user interface
comprised of 3 sections:
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Cube Avenue
Application Manager : flow-chart style tool for
building model systems
Scenario Manager: tool for applying the model to
multiple scenarios
Graphics: editing of all data in text, tabular and
graphical form
‘Functional Libraries:
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VOYAGER
TP+
TRANPLAN
TRIPS
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CARGO
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AVENUE
DYNASIM
Analyst
LAND (in development)
LOGIT (in development)
Transportation modeling tools
 Macroscopic Modeling
 Mesoscopic Modeling
 Microscopic Modeling
Macroscopic Modeling
 Macroscopic Models generally consider the entire system and estimate
routing and flows through a network for a time period.
 Currently used for almost all strategic (long-range) planning.
 FSUTMS Models
 Very fast analysis of very large areas.
 Models the behavior of people taking into account:
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Why people are making trips
Why they select a particular mode
Why they select a particular route
Cube Voyager
 the latest technology for the forecasting of personal travel.
 a modular and script-based structure allowing the incorporation of any
model methodology
 HCM junction-based capacity restraint for highway analysis
 includes highly flexible network and matrix calculators for the calculation
of travel demand and for the detailed comparison of scenarios.
 designed to provide an open and user-friendly framework for modeling at
any level
 This makes the management of data a snap, and the coding of complex
methodologies simple via a step-by-step approach.
Cube Voyager Model
Highway Traffic Flow
Mesoscopic Models
 MESOscopic are MORE detailed than MACROscopic travel demand models
but are LESS detailed than MICROscopic simulation models.
 Cube Avenue, a mesoscopic dynamic assignment model is available for
CUBE.
 With mesoscopic models, it is still possible to quickly analyze larger areas
with a more detailed model which overcomes the pitfalls of the
macroscopic travel demand models.
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Takes into account intersection configurations and controls
More detailed estimates of delay, travel time, and capacities
Enforces capacity limitations and the effects of queues ‘blocking back’
Models flow curves and changing demand throughout an analysis period
Allows vehicles to respond to traffic conditions and change their route
Cube Avenue
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representing vehicles as discrete packets or individual vehicles
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assigning a specific time of departure from the origin point in the network to
each packet or vehicle
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routing the vehicles along multiple paths in response to dynamic traffic
conditions
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representing queues and bottlenecks including ‘blocking back’ or the formation
of queues on a roadway segment or at an intersection which spill back up-stream
to block roadway segments which feed into the roadway segments
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Region-wide, corridor-level
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Evacuation modeling, greater analysis of geometrics, traffic control and ITS
strategies
Quantify impacts of upstream traffic congestion
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Summary of Avenue:
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Measure queuing at intersections and merge points in a network
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Isolate secondary impacts from one intersection through another
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Evaluate the benefits of ITS (intelligent transportation system) projects
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Simulate alternative infrastructure, operational, and policy changes to optimize emergency evacuation plans and
strategies
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Test strategies to improve arrival and departure from stadiums and other special-event facilities
NERPM Dynamic Traffic Assignment
Build TOD Vehicle Trips
Establish Dynamic
Assignment Parameters
Dynamic Traffic
Assignment
NERPM DTA Animation
Microscopic Modeling
 Microscopic models are VERY detailed and take into account vehicle’s
interactions with the following aspects:
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The roadway geometry (lanes, turning lanes, weaving areas, exclusive lanes)
Physical size of different types of vehicles
Details of traffic control (signal timing, phasing, geometric configurations)
 Microsimulations are Stochastic (contain random processes) which
emulates:
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The fluctuating nature of traffic flows
Variations in human behavior and responses
 Microsimulations are Multimodal and can consider the effects of traffic
interacting with all other users of the transportation system:
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Pedestrians, Bicyclists, Motorcyclists
Trucks and other Heavy Vehicles
Transit vehicles, Taxis, Light and Heavy rail vehicles
Cube Dynasim
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Integration with demand models
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Stand alone microsimulation
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Only one Dynasim project for all simulation alternatives
Eliminates redundancy
Ensures consistency
Analysis of Multiple Runs inherent to the system
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Export of shape layers and images
Use of industry standard 3ds files for high quality 3d
True sharing of results via exportable animations
Scenario-based Simulation
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Layered approach much more intelligent than other software
2d and 3d animation
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Polygon select of an area and export of data to the microsimulation. Saves enormous time
Automatically performs multiple runs and summarizes results
Ensures a robust analysis with no additional burden on the user
Interactive Results
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Completed simulations may be exported to a DynaViews program
Interactive Animations with the same features as Dynasim
Freely distributable
Building a Dynasim Simulation
Dynasim Simulation
Roundabout Simulation
Bus Terminal Simulation
Summary
 Modern software platform providing:
– integrated environment for regional planning
– regional traffic simulation
– corridor level detailed project evaluation
Cube Voyager for regional
planning – traffic flows
Cube Avenue (DTA) for regionwide simulation – queues/ delays
Cube Dynasim for corridor
simulation = animations
Questions