Document type
ArticleVersion
Accepted versionPublication date
Publication license
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/122913
The environmental effects of changing speed limits: A quantile regression approach
Journal Title
Director/Tutor
Additional contribution
Journal ISSN
Volume Title
Abstract
Two speed management policies were implemented in the metropolitan area of Barcelona aimed at reducing air pollution concentration levels. In 2008, the maximum speed limit was reduced to 80 km/h and, in 2009, a variable speed system was introduced on some metropolitan motorways. This paper evaluates whether such policies have been successful in promoting cleaner air, not only in terms of average pollutant levels but also during high and low pollution episodes. To do so, we use a quantile regression approach for fixed effect panel data, which allows us analyzing different scenarios (beyond the average levels). We find that the variable speed system improves air quality with regard to the two pollutants considered here, being most effective when nitrogen oxide levels are not too low and when particulate matter concentrations are below extremely high levels. However, reducing the maximum speed limit from 120/100 km/h to 80 km/h has no effect - or even a slightly increasing effect - on the two pollutants, depending on the pollution scenario.
Related resource
Subject (English)
Citation
Citation
BEL I QUERALT, Germà, et al. The environmental effects of changing speed limits: A quantile regression approach. Transportation Research Part D: Transport and Environment. 2015. Vol. 36, num. May, pags. 76-85. ISSN 1361-9209. [consulted: 16 of October of 2026]. Available at: https://hdl.handle.net/2445/122913