The ITF Transport Outlook 2021 provides scenarios for the development of transport demand up to 2050. It also models transport decarbonisation scenarios and their impacts on climate change. Based on this, the ITF Transport Outlook 2021 identifies decisions that policy makers will need to take to ensure a transition to sustainable mobility that is effective as well as equitable. This edition includes a special focus on the impacts of the Covid-19 pandemic on transport systems, and models potential long-term changes with challenges and opportunities for decarbonisation.