Integrated Travel Demand and Traffic Modeling
Used in combination with TransCAD,
TransModeler provides an unprecedented capability for integrated demand and
traffic modeling. Demand forecasts can be subjected to more detailed
operational analysis in TransModeler. Traffic assignment results can be
modeled dynamically in the time domain to identify bottlenecks, queues, and
the actual capacity of the road network. Used together, you can more fully
understand the trip distribution, mode choice, and route choice impacts of
major construction projects.
TransModeler is designed to dovetail with TransCAD and includes
additional features that streamline the use of simulation for travel demand
forecasting. This makes it straightforward to:
-
Use
origin-destination trip matrices to model vehicle demand with
time-variant departure rates and multiple vehicle classes
- Simulate vehicles from multiple matrices for different times of day
and/or different vehicle characteristics
- Control the vehicle inter-departure profile with a constant rate, a
time-based curve, or a series of matrices with varying start times
- Match observed traffic conditions with a variety of parameters that
control the randomness and scale of each matrix
- Load trips in a matrix from node to node, link to link, centroid to
centroid or between any combination of nodes, links and centroids
- Specify the properties of each matrix, such as vehicle class, HOV
eligibility, and driver groups representing route choice characteristics
You can generate many simulation inputs directly from TransCAD or another
planning model.
- Convert your geographic line layer to a traffic network database
format ready for additional editing for simulation
- Use trip matrices generated by your trip distribution model as input
demand for your network
- Use the powerful trip table estimator in TransCAD to generate trip
tables that are consistent with traffic counts
- Run a Stochastic User Equilibrium or a Dynamic User Equilibrium
traffic assignment to generate congested link travel times, flows, and
turning movements as input to the TransModeler route choice models
You can create and manage alternative paths available to drivers in large
and complex networks.
- Use sophisticated route choice and pathfinding methods in
TransModeler to automatically generate feasible paths for all vehicles
- Modify the path table created by TransModeler or use map-based
graphical tools to draw your own paths and create your own path table
- Map a vehicle’s current path or map the probability that a vehicle
will traverse any given link when traveling between a given
origin-destination pair
