A modeling framework for impact assessment of urban transport systems G. Ambrosino, a, * P. Sassoli, a M. Bielli, b P. Carotenuto b , M. Romanazzo c a ATAF, via Pratese 105, 50145 Firenze, Italy b CNR-PFT2, viale dell'Universita Á 11, 00185 Roma, Italy c ENEA, Transport Dept., Viale Regina Margherita 125, 00189 Roma, Italy Received for publication 30 April 1998 Abstract An integrated software tool environment is presented, and a methodology is proposed for the opera- tional support of the local authority, for analysis of the impact of transport measures in terms of network energy consumption and pollutant emissions. It is based on work done by the European Union within the save program (speci®c actions for vigorous energy eciency)ÐSlam project (supporting local authorities methodology). As background, the Slam project is described, with the principal aspects and needs of environmental and trac network management. The central section de®nes a methodology able to support technicians in recognizing the trac asset and decision makers in evaluating interventions on urban transport infrastructures or technological systems. The role of the dierent models and their interactions with the transport telematics services currently active on the Florence (Italy) network is discussed. Finally, the procedure for calculating the trac impacts on energy consumption is described with the help of a test case, the evaluation of a dedicated bus corridor in Florence. # 1999 Published by Elsevier Science Ltd. All rights reserved. Keywords: Models; Assessment; Software; Urban transport 1. Introduction Sustainable mobility in an urban context requires a set of coordinated interventions aimed at improving the energy eciency of the transport network. This involves a reduction of the total energy used by transport systems, and this can be achieved through the shift of a signi®cant portion of the demand from private to public means and the continuous monitoring of the 1361-9209/99/$ - see front matter # 1999 Published by Elsevier Science Ltd. All rights reserved. PII: S1361-9209(98)00014-5 TRANSPORTATION RESEARCH PART D Transportation Research Part D 4 (1999) 73±79 * Corresponding author.