The objective of this work was to determine the effect of\ud one form of traffic calming on emissions. Traffic calming\ud is aimed at reducing average vehicle speeds, especially\ud in residential neighborhoods, often using physical road\ud obstructions such as speed bumps, but it also results in\ud a higher number of acceleration/deceleration events\ud which in turn yield higher emissions. Testing was\ud undertaken by driving a warmed-up Euro-1 spark ignition\ud passenger car over a set of speed bumps on a level\ud road, and then comparing the emissions output to a noncalmed\ud level road negotiated smoothly at a similar\ud average speed. For the emissions measurements, a\ud novel method was utilized, whereby the vehicle was\ud fitted with a portable Fourier Transform Infrared (FTIR)\ud spectrometer, capable of measuring up to 51 different\ud components in real-time on the road. The results\ud showed that increases in emissions were much greater\ud than was previously reported by other researchers using\ud different techniques. When traffic-calmed results were\ud compared to a smooth non-calmed road, there were\ud substantial increases in CO2 (90%), CO (117%), NOx\ud (195%) and THC (148%). These results form the basis\ud for a good argument against traffic calming using speed\ud bumps, especially for aggressive drivers. Slowing traffic\ud down with speed restrictions enforced by speed\ud cameras is a more environmentally friendly option
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