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TMODEL 2 Definition - Fauquier County

TMODEL 2 Definition - Fauquier County

TMODEL 2 Definition - Fauquier

TMODEL2 TMODEL is a package of tools used to construct and analyze multi-modal transportation planning models, also known as a 4-step models. It is usually used to build a peak-hour model because it accounts for street and intersection (link and node) congestion in the development of travel times. This notion is best applied to peak hour rather than average daily traffic volumes. After a modeler enters land use or socioeconomic data (population and employment) and network (street and intersection) data, the model distributes or allocates an appropriate number of trips from each zone, or land use area, to each other zone. It then assigns those trips to the streets of the network based on the least cost (time and/or distance) paths. TMODEL is a mathematical model. It allows the user to select operating formulas and coefficients, to insert land use and street network data, and then to calibrate [iteratively adjust these coefficients and data] until the model produces traffic volumes that closely approximate known counts for the network. Using a calibrated model, the final data and parameters, a planner or engineer can then insert projected land uses and/ or transportation network system improvements in order to test for resulting traffic flows and problem facilities. Finally, after generating a distribution and assignment, TMODEL offers full analysis and reporting capabilities through tables, graphs, and mapping capabilities. INTERSECTION MODELING Historically, regional models and the microcomputer models based on them have modeled the transportation network as a set of connected links. To account for the delays caused by the intersections, the operational capacity and speed of the links had to be adjusted to some "planning capacity" and "planning speed" which would hopefully produce reasonable "operational" travel times. This causes an inherent problem. The modeler needed to assign capacities and speeds to each link along a particular route to account for intersection delays of various magnitudes. Since there is no operational definition for these capacities or speeds, they can only be obtained by seeing whether they then cause assignment of appropriate volumes. The capacity constraint function and capacities are based, therefore, on a circular argument and probably appropriate only for calibration conditions. One should then question whether future scenario volumes would have any meaning given those skewed capacity and speed definitions. TMODEL includes the intersections when computing and analyzing travel times. In most situations, intersections rather than streets are typically the constraining factor on traffic flow. Accordingly, the TMODEL program allows for an intersection capacity description, use of intersection volume-to-capacity ratio (V/C) constraint functions and the use of dynamic turn penalty functions. Through these techniques and functions, the user can describe an appropriate operational link capacity along the route. He can then define separate intersection capacity and turn

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