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- W9664812 abstract "Insight into traffic flow characteristics is often gained using local measurements. To determine macroscopic flow characteristics, time aggregation of microscopic information is required. Usually, a data collection system stores values averaged over time. However, it is well known that a time mean average overestimates the influence of faster vehicles, and consequently overestimates the mean speed. As a direct result, densities, computed from flow and speed, are underestimated. This paper compares the time mean speed and space mean speed, using data of individual car passages on a motorway road stretch. We show that the differences between time mean and space mean averages are substantial, up to a factor four. In particular in the lower speed regions the error is big. We indicate the considerable consequences for the jam density and shock wave speed. Finally, a fundamental diagram based on correctly averaged microscopic data can be fitted much better." @default.
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- W9664812 date "2009-01-01" @default.
- W9664812 modified "2023-10-08" @default.
- W9664812 title "Empirical Differences Between Time Mean Speed and Space Mean Speed" @default.
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- W9664812 doi "https://doi.org/10.1007/978-3-540-77074-9_36" @default.
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