In 1996 on-board measurements were performed on six passenger cars. These tests were executed in the centre of Brussels under various traffic conditions. All vehicles were measured for both fuel consumption and CO_2 emissions. Two were also measured for CO, HC and NO_x emissions. The chief emphasis was put on driving in the rush hour and smooth-flowing (on Sundays) traffic. The principal aim was to obtain realistic fuel consumption and exhaust emission values for Brussels. Secondly, to gain an insight into the relationship between consumption and emission on the one hand and the process of traffic on the other. Furthermore, the measurement results have been used to upgrade an existing microscope traffic model with a fuel consumption module. In the process of designing an intersections and traffic control measures, energy and environmental aspects have to be taken into account if a more sustainable mobility is to be obtained.
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