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Environmental speed limits : do temporary speed limits improve air quality?

Westby, Benjamin S.; Folgerø, Ingrid Kristine
Master thesis
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URI
http://hdl.handle.net/11250/2453482
Date
2017
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  • Master Thesis [3258]
Abstract
In 2004, Oslo introduced a policy that involved a temporary reduction in the maximum

speed limit of 20 km/h (80 – 60 km/h) during the winter. The aim of this policy was to

improve local air quality in order to reduce the adverse health effects related to air pollution.

This master´s thesis analyses the effectiveness of implementing environmental speed limits

on the choice of speed and local air quality in Oslo. We use an ordinary least square

regression (OLS) and a regression discontinuity design (RDD) to perform a pooled cross

section analysis on four air pollutants, PM2.5, PM10, NO2 and NOX, for two selected

roadways during the period 2006 – 2011. Our estimates are based on hourly data from

multiple monitoring stations and independent data sources.

Our findings indicate a 5.8 km/h reduction in travel speed. However, there is no robust

evidence of an improvement in air quality for any of the air pollutants. Our conservative

cost–benefit calculation suggest that implementation of the environmental speed limits is

associated with a net social loss of 4,120,000,000 NOK each environmental speed limit

period. These findings suggest that the implementation and further expansions of the

environmental speed limit policy is ill-advised and entails a loss to the society. The

inefficiency of environmental speed limits suggest that other actions are necessary to

improve local air quality in Oslo

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