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Transport and Telecommunication Journal

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Homogenization Effects of Variable Speed Limits

Alvaro Garcia-Castro
  • Corresponding author
  • Transportation Research Centre (TRANSyT) Universidad Politecnica de Madrid. Escuela de Ingenieros de Caminos, Canales y Puertos, Avda. Profesor Aranguren s/n. Madrid. Spain Phone: +34 91 336 52 34. Fax: +34 91 336 53 62.
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  • De Gruyter OnlineGoogle Scholar
/ Andres Monzon
  • Transportation Research Centre (TRANSyT) Universidad Politecnica de Madrid. Escuela de Ingenieros de Caminos, Canales y Puertos, Avda. Profesor Aranguren s/n. Madrid. Spain Phone: +34 91 336 52 34. Fax: +34 91 336 53 62
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2014-04-25 | DOI: https://doi.org/10.2478/ttj-2014-0012


Changing factors (mainly traffic intensity and weather conditions) affecting road conditions require a suitable optimal speed at any time. To solve this problem, variable speed limit systems (VSL) - as opposed to fixed limits - have been developed in recent decades. This term has included a number of speed management systems, most notably dynamic speed limits (DSL). In order to avoid the indiscriminate use of both terms in the literature, this paper proposes a simple classification and offers a review of some experiences, how their effects are evaluated and their results This study also presents a key indicator which measures the speed homogeneity and a methodology to obtain the data based on floating cars and GPS technology applying it to a case study on a section of the M30 urban motorway in Madrid (Spain). It also presents the relation between this indicator and road performance and emissions values.

Keywords: Effectiveness indicator; variable speed limits; dynamic speed limits; GPS application; speed management; floating car data


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About the article

Published Online: 2014-04-25

Published in Print: 2014-06-01

Citation Information: Transport and Telecommunication Journal, ISSN (Online) 1407-6179, ISSN (Print) 1407-6160, DOI: https://doi.org/10.2478/ttj-2014-0012.

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© Transport and Telecommunication Institute. This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. BY-NC-ND 3.0

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