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- W4246218118 abstract "It is known that if q vehicles at speed v pass a fixed point per unit time, randdomly and independently, and mix with another set q' , v' , then the expected number of overtakings per unit length of road per unit time is qq' ( v' – v )/ vv' . If k, k' are the concentrations, i.e., number per unit length of road, this rate can also be expressed as kk' ( v'– v ) and as q'k – qk' . It is also the expected number of intersections per unit area on the space-time diagram, where the vehicle paths are represented by sets of random parallel lines. If each set is represented by a vector with magnitude equal to the density (i.e., inverse of the spacing), the rate is equal to the magnitude of the vector product. This is extended to the general case of a stream of vehicles with distributed speeds. This has an equivalent vector, whose components are the total concentration (in the direction of the time axis) and total flow (distance direction). This leads to the concept of the cumulative vector curve in problems of geometrical probability. The extension to the case of variable flows and speeds is indicated. The vector representing the distribution of speeds is then variable, but satisfies a condition of continuity which makes its divergence vanish." @default.
- W4246218118 created "2022-05-12" @default.
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- W4246218118 date "1974-12-01" @default.
- W4246218118 modified "2023-09-25" @default.
- W4246218118 title "The vectorial representation of the frequency of encounters of freely flowing vehicles" @default.
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- W4246218118 doi "https://doi.org/10.2307/3212562" @default.
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