The sensitivity of pollutant emissions as regards driving speed is demonstrated using emission functions currently available from the literature. An accurate and detailed knowledge of actual driving speeds is then fundamental for emissions estimations and inventories. However, speed information is often limited and heterogeneous. Through a European synthesis, the authors examine various means of investigation: surveys, vehicle instrumentation, traffic modeling, and others. Available statistics provide a high number of reference values for passenger cars and duty vehicles by broad categories and highlight the influence of numerous factors on speed: time period, city size and area, trip origin and destination, and vehicle types. Speed estimations and ranges are proposed for driving in urban areas, on rural roads, and on highways. The significant variations of the speed according to time of day, to areas of a city, and the large dispersion for a given situation raise the question of using single average values. Emissions estimation can be affected by 30% by the quality of driving speed data.


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  • Accession Number: 00797673
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Aug 22 2000 12:00AM