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  2. Fundamental diagram of traffic flow - Wikipedia

    en.wikipedia.org/wiki/Fundamental_diagram_of...

    The primary tool for graphically displaying information in the study traffic flow is the fundamental diagram. Fundamental diagrams consist of three different graphs: flow-density, speed-flow, and speed-density. The graphs are two dimensional graphs. All the graphs are related by the equation “flow = speed * density”; this equation is the ...

  3. Traffic flow - Wikipedia

    en.wikipedia.org/wiki/Traffic_flow

    Traffic flow. In transportation engineering, traffic flow is the study of interactions between travellers (including pedestrians, cyclists, drivers, and their vehicles) and infrastructure (including highways, signage, and traffic control devices), with the aim of understanding and developing an optimal transport network with efficient movement ...

  4. Three-phase traffic theory - Wikipedia

    en.wikipedia.org/wiki/Three-phase_traffic_theory

    Three-phase traffic theory is a theory of traffic flow developed by Boris Kerner between 1996 and 2002. [1][2][3] It focuses mainly on the explanation of the physics of traffic breakdown and resulting congested traffic on highways. Kerner describes three phases of traffic, while the classical theories based on the fundamental diagram of traffic ...

  5. Bernoulli's principle - Wikipedia

    en.wikipedia.org/wiki/Bernoulli's_principle

    Rather, Bernoulli's principle was derived by a simple manipulation of Newton's second law. A streamtube of fluid moving to the right. Indicated are pressure, elevation, flow speed, distance (s), and cross-sectional area. Note that in this figure elevation is denoted as h, contrary to the text where it is given by z.

  6. Stock and flow - Wikipedia

    en.wikipedia.org/wiki/Stock_and_flow

    A stock is measured at one specific time, and represents a quantity existing at that point in time (say, December 31, 2004), which may have accumulated in the past. A flow variable is measured over an interval of time. Therefore, a flow would be measured per unit of time (say a year). Flow is roughly analogous to rate or speed in this sense.

  7. Fluid dynamics - Wikipedia

    en.wikipedia.org/wiki/Fluid_dynamics

    e. In physics, physical chemistry and engineering, fluid dynamics is a subdiscipline of fluid mechanics that describes the flow of fluids — liquids and gases. It has several subdisciplines, including aerodynamics (the study of air and other gases in motion) and hydrodynamics (the study of liquids in motion).

  8. Flow map - Wikipedia

    en.wikipedia.org/wiki/Flow_map

    Flow map. Charles Joseph Minard map of the 1812 French invasion of Russia. A flow map is a type of thematic map that uses linear symbols to represent movement between locations. [1] It may thus be considered a hybrid of a map and a flow diagram. The movement being mapped may be that of anything, including people, highway traffic, trade goods ...

  9. System dynamics - Wikipedia

    en.wikipedia.org/wiki/System_dynamics

    Dynamic stock and flow diagram of model New product adoption (model from article by John Sterman 2001 - True Software). System dynamics (SD) is an approach to understanding the nonlinear behaviour of complex systems over time using stocks, flows, internal feedback loops, table functions and time delays.

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