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This study provides an in-depth analysis of the potential role of hydrogen (H 2) in the Belgian transport sector in the context of sustainable and environmentally friendly growth. This paper starts by examining the energy-climate roadmap and the emission mitigation programme defined by the Belgian federal government in the context of environmental sustainability. Then, the Belgian situation is critically evaluated in light of the needs for H 2 fuel in the transport sector, as well as issues about a roadmap on environmental considerations for a sustainable future, while preserving the country's economic stakes. There are several key advances in this direction, especially as H 2 is seen as one of the best viable options for sustained development, unlike other possibilities. This paper also highlights some limitations that make it difficult to accelerate the transition to a sustainable H 2 energy future. Although there are many interests in favour of an advanced and non-polluting transport system, there are differing views on the approach to be taken in political decision-making at national level. Therefore, this study will help public authorities to better integrate environmental and sustainability issues in the context of a transition to a comprehensive hydrogen economy in the current transport sector. • An in-depth analysis of hydrogen's role in the Belgian transport sector is presented. • Considerations of sustainable and environmentally friendly growth are addressed. • It highlights the constraints and barriers to the full development of H 2 in Belgium. • There is no unified national public policy for hydrogen development. • Policies should prioritise R&D, training and social empowerment of hydrogen energy. [ABSTRACT FROM AUTHOR]