Urban Transportation and Environment. Proceedings of CODATU IX, 11-14 April 2000, Oscar Diaz, Gonzalez Palomas & Christian Jamet, eds. Balkema, Rotterdam, 109-114 STARTPAGE=109;ENDPAGE=114;TITLE=Urban Transportation and Environment. Proceedings of CODATU IX, 11-14 April 2000, Oscar Diaz, Gonzalez Palomas & Christian Jamet, eds. Balkema, Rotterdam