Keywords: sustainable transport, transport efficiency, sustainability, sustainable development
Introduction: At the cross-roads of efficiency and sustainability
It is clear that sustainable transport is a challenging research and policy task. It requires a solid quantitative modelling, a collection of extensive databases, an analysis of the span of control of governments and stakeholders and a creative open mind in regard to the future. The case of a more mobile society and of justified demands of the Third World will prompt many intricate concerns, in which a blend of technological, behavioural and regulatory research and policy initiatives will be needed. Some progress has been made in the past years, but much more progress is necessary in the years to come. In particular, due attention is needed for the relationship between sustainability and efficiency in transport. This paper introduces both the topic of efficient and sustainable transportation systems and also, briefly, the papers from the special issue.