Providing new insights into the relationship between transport and the environment, and the meaning of the concept of sustainable development for the transport sector, special attention is paid to the relationship between technological progress and policy. The different theoretical approaches are combined to create a strategy for R&D and the implementation of mega-technological innovations. The author deals with two specific cases: Maglev technology and fuel-cell technology for transport purposes. Taking into account the new theoretical insights and the empirical findings, the resulting synthesis and conclusions are important for researchers and professionals in transportation, environmental sciences and related fields.