The effects of traffic calming on vehicle emissions have been measured or modelled in only a small number of European studies, and the results have tended to be highly variable. There is a need to measure emissions in the laboratory to provide more reliable information and to validate models. However, there is also a need to determine the extent to which the measured and modelled changes in emissions are reflected in the vehicle fleet on the road. The possibility that a remote sensing system might be used to assess the effects on fleet emissions of the changes in vehicle operation has been expressed previously, though the applicability of remote sensing in this context is unclear. To address these issues, this Report describes a study in which the effects of two different traffic calming measures on emissions from traffic were investigated using a remote sensing system. The measures were installed in the Longlevens area of Gloucester in November 1997 as part of the Safer City Project. (A)

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