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TransModeler's road editor natively supports two-way links and roads, which enables automatic handling for two-way left-turn lanes (TWLTL) and automatic handling of overtaking/passing on two-lane highways. Calibration methods like Origin-Destination Matrix Estimation (ODME) are also available. Simulation-based dynamic traffic assignment (DTA) can be used to inform vehicle's route choices. The trip-based routing handles a wide variety of intelligent transportation system (ITS) features such as managed lanes (such as HOV and HOT lanes), electronic toll collection, route guidance, and traffic detection and surveillance. Demand can also be simulated using turning movement volumes. TransModeler is inherently a trip-based microscopic simulation package. Pedestrian crossing demand can also be simulated. Transit route system travel demand can be specified as either schedule or headway based. TransModeler simulates public transportation as well as bicycle, car, and truck traffic. TransModeler includes a relational database and a matrix engine for native matrix operations. TransModeler includes a proprietary BASIC-like programming language (Caliper Script) within a development interface (GISDK) that allows automation of the TransModeler environment. TransModeler integrates with TransCAD, the travel demand forecasting software. Like other Caliper Corporation products, TransModeler is a native GIS environment. It can be used to model and visualize the behavior of traffic systems in a 2-dimensional or 3-dimensional GIS environment to illustrate and evaluate traffic flow dynamics, traffic signal and ITS operations, connected and automated vehicles (CAVs), and overall network performance. TransModeler can simulate many kinds of road networks, including freeways and downtown areas, and can analyze wide-area multimodal networks. TransModeler is a traffic simulation package applicable to a wide array of traffic planning and modeling tasks.