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For a particular type of vehicle, fuel consumption and pollutant emission rates are mainly a function of the vehicle's use (journey type, frequency, etc…), and of the vehicle's operating conditions (speed, engine speed, rates of acceleration, temperature conditions, etc…), and depend on both the traffic conditions and the individual behaviour of the driver. Thus, a realistic assessment of emissions, pollution reduction methods and the effectiveness of emission control technologies cannot be carried out without taking into account the actual operating conditions of the vehicles. For that reason, a project has been carried out as part of the EC DRIVE programme to measure engine and vehicle operating conditions during normal driving. 58 private cars were equipped with sensors and data acquisition systems to record details of their use by their owners, each over a period of about one month.