Empirical differences between time mean speed and space mean speed

VL Knoop; SP Hoogendoorn; HJ van Zuylen

doi:10.1007/978-3-540-77074-9_36

Empirical differences between time mean speed and space mean speed

VL Knoop, SP Hoogendoorn, HJ van Zuylen

Transport and Planning

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific

35 Citations (Scopus)

240 Downloads (Pure)

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.

Original language	English
Title of host publication	Traffic and granular flow 2007
Editors	C Appert-Rolland, F Chevoir, P Gondret, S Lassarre, JP Lebacque, M Schreckenberg
Place of Publication	Heidelberg
Publisher	Springer
Pages	351-356
Number of pages	6
ISBN (Print)	978-3-540-77073-2
DOIs	https://doi.org/10.1007/978-3-540-77074-9_36
Publication status	Published - 2009
Event	Traffic and Granular Flow '07, Orsay, France - Heidelberg Duration: 20 Jun 2007 → 22 Jun 2007

Publication series

Name
Publisher	Springer

Conference

Conference	Traffic and Granular Flow '07, Orsay, France
Period	20/06/07 → 22/06/07

Keywords

Conf.proc. > 3 pag

Access to Document

10.1007/978-3-540-77074-9_36

Empirical differences between time mean speed and space mean speedFinal published version, 1.83 MB

Cite this

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title = "Empirical differences between time mean speed and space mean speed",

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.",

keywords = "Conf.proc. > 3 pag",

author = "VL Knoop and SP Hoogendoorn and {van Zuylen}, HJ",

year = "2009",

doi = "10.1007/978-3-540-77074-9_36",

language = "English",

isbn = "978-3-540-77073-2",

publisher = "Springer",

pages = "351--356",

editor = "C Appert-Rolland and F Chevoir and P Gondret and S Lassarre and JP Lebacque and M Schreckenberg",

booktitle = "Traffic and granular flow 2007",

note = "Traffic and Granular Flow '07, Orsay, France ; Conference date: 20-06-2007 Through 22-06-2007",

}

Knoop, VL , Hoogendoorn, SP & van Zuylen, HJ 2009, Empirical differences between time mean speed and space mean speed. in C Appert-Rolland, F Chevoir, P Gondret, S Lassarre, JP Lebacque & M Schreckenberg (eds), Traffic and granular flow 2007. Springer, Heidelberg, pp. 351-356, Traffic and Granular Flow '07, Orsay, France, 20/06/07. https://doi.org/10.1007/978-3-540-77074-9_36

Empirical differences between time mean speed and space mean speed. / Knoop, VL ; Hoogendoorn, SP; van Zuylen, HJ.
Traffic and granular flow 2007. ed. / C Appert-Rolland; F Chevoir; P Gondret; S Lassarre; JP Lebacque; M Schreckenberg. Heidelberg: Springer, 2009. p. 351-356.

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific

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T1 - Empirical differences between time mean speed and space mean speed

AU - Knoop, VL

AU - Hoogendoorn, SP

AU - van Zuylen, HJ

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AB - 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.

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T2 - Traffic and Granular Flow '07, Orsay, France

Y2 - 20 June 2007 through 22 June 2007

ER -

Empirical differences between time mean speed and space mean speed

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