1. André, M., Hammarström, U., Reynaud, I., 1999. Driving statistics for the assessment of air pollutant emissions from road transport. INRETS Report LTE9906, Bron, France.
2. Borken, J., Knörr, W., Höpfner, U., 2000. Energy consumption and pollutant emissions from road transport in Belgium 1980 to 2020. Institut für Energie und Umweltforschung Heidelberg GmbH (IFEU), Study commissioned by Fédération Belge de l’Industrie de l’ Automobile et du Cycle (FEBIAC), Heidelberg/Brussels. 41pp.
3. Cox, J.A., Hickman, J., 1998. Aggregated emission factors for road and rail transport. Deliverable 23 for the MEET project, TRL Contract No. ST-96-SC.204, Berkshire, UK, 88pp.
4. Dirección General de Tráfico, 1988–1999. Anuario Estadı́stico General (General Statistical Report), 12 Vols. DGT, Madrid, Spain.
5. European Commission Standard & Poor's DRI and KU Leuven, 1999. The AOP II cost effectiveness study part III: the transport base case. Report, 47pp and 9 Annexes.