The Royal Commission for Makkah City and Holy Sites has initiated a second phase of a hydrogen bus trial in Makkah in collaboration with energy, transport, and safety authorities. The trial aims to provide a zero-emission transport solution for pilgrims visiting the holy city. The buses in this trial are equipped with a mobile refuelling station, allowing them to offer a range of 500 km and enabling quick refuelling in under 15 minutes. To ensure safety, strict protocols supervised by the Civil Defense and Traffic teams have been implemented, including leak detection systems and the use of fire-resistant materials. Moreover, the new buses will operate on designated routes to avoid congested roads, especially during peak pilgrimage times. The initial feedback from the trial was positive, with 89% of passengers expressing satisfaction with the quiet and smooth travel experience. This initiative showcases the commitment of Makkah City to embrace sustainable and innovative transportation solutions for the benefit of its residents and visitors.