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  2. File:Speed-flow horseshoe diagram traffic congestion.svg

    en.wikipedia.org/wiki/File:Speed-flow_horseshoe...

    English: Speed-flow diagram or speed-volume diagram: vehicle speed versus vehicles per hour passing through a point on a highway. The horseshoe shape indicates that vehicle throughput collapses when volume is 80%-100% of capacity. The traffic mode changes from free-flowing in the green area, to congested in the gray area.

  3. Fundamental diagram of traffic flow - Wikipedia

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

    Once the optimum flow is reached, the diagram switches to the congested branch, which is a parabolic shape. The second speed flow diagram is a parabola. The parabola suggests that the only time there is free flow speed is when the density approaches zero; it also suggests that as the flow increases the speed decreases.

  4. Traffic flow - Wikipedia

    en.wikipedia.org/wiki/Traffic_flow

    Free-flowing traffic is characterized by fewer than 12 vehicles per mile per lane, whereas higher densities can lead to unstable conditions and persistent stop-and-go traffic. Models and diagrams, such as time-space diagrams, help visualize and analyze these dynamics. Traffic flow analysis can be approached at different scales: microscopic ...

  5. Flow map - Wikipedia

    en.wikipedia.org/wiki/Flow_map

    1838 map of pre-railroad cargo traffic in Ireland, one of the first thematic maps to use proportional symbols. The earliest known map to visually represent the volume of flow were two maps by engineer Henry Drury Harness, published in 1838 as part of a report on the potential for railroad construction in Ireland, showing the quantity of cargo traffic by road and canal.

  6. Three-phase traffic theory - Wikipedia

    en.wikipedia.org/wiki/Three-phase_traffic_theory

    In congested traffic, the vehicle speed is lower than the lowest vehicle speed encountered in free flow, i.e., the line with the slope of the minimal speed = in free flow (dotted line in Figure 2) divides the empirical data on the flow-density plane into two regions: on the left side data points of free flow and on the right side data points ...

  7. Newell's car-following model - Wikipedia

    en.wikipedia.org/wiki/Newell's_car-following_model

    Thus, τ and δ are constants defined by the wave speed and jam density, independent of the speed of the leading vehicle and the traffic state. The path of vehicle i, a function of time, can be determined using the equation: x i (t) = min(x A F (t), x A C (t)) Position of vehicle i under free-flow conditions: x i F (t) = x i (t-τ) + v f * τ

  8. Road signs in the United States - Wikipedia

    en.wikipedia.org/wiki/Road_signs_in_the_United...

    11th edition of the MUTCD, published December 2023. In the United States, road signs are, for the most part, standardized by federal regulations, most notably in the Manual on Uniform Traffic Control Devices (MUTCD) and its companion volume the Standard Highway Signs (SHS).

  9. Traffic congestion map - Wikipedia

    en.wikipedia.org/wiki/Traffic_congestion_map

    A traffic congestion map is a graphical, realtime or near-realtime representation of traffic flow for some particular area. [1] Data is typically collected via anonymous GPS datapoints and loop sensors embedded in the roadways, then processed by computer at a central facility and distributed as a map view to users.