The overall goal of this project is to develop two ZEM model regions, an urban and an alpine/touristic, for public bus transport and two pilot-projects for transition of heavy-duty trucks. The main objectives within both model regions are (i) the development of novel holistic vast area ZEM public bus concepts, (ii) implementation of these ZEM bus concepts for 10 bus lines (32 buses), (iii) implementation of FCE heavy-duty transport (4 FCE garbage trucks and 4 FCE-trucks), (iv) development and implementation of a green hydrogen infrastructure including innovative sector-coupling and balancing energy services.