Urban Transport XXI

The success of the conference rests on the need to continually improve urban transport systems, as well as reduce their environmental impact. The development of appropriate urban transport systems is one of the fundamental concepts to achieving sustainable cities, as transportation systems represent major consumers of energy and sources of pollution. Over the years, a series of innovations have been proposed, many of them reported in the proceedings of this conference. Some of those have become well established after their critical evaluation in practice, while the conference continues to report new approaches and original ideas. All components of urban transport systems require optimization and, equally important, integration between different transportation modes. This objective is now more feasible due to the emerging of powerful IT tools which can improve their safety, security and efficiency, while helping to reduce pollution by the optimal use of energy resources.