Truckmakers, including Volvo and MAN, are exploring the use of low-emission hydrogen in combustion engines as a quick and cost-effective solution for transitioning to zero emissions. Electric batteries are not practical for long-haul freight operations due to their weight and long charging times. While hydrogen fuel cells offer extended range and reduced weight, they require the design of new truck systems, making them an expensive option. By developing hydrogen combustion engines, truck manufacturers can rely on existing manufacturing lines, preserving jobs and minimizing disruption. These engines will serve as a bridge to the adoption of hydrogen fuel cells and batteries. MAN will deliver around 200 trucks with hydrogen engines for testing in European fleets next year, while Volvo plans to start customer tests of hydrogen combustion engine models in 2026. However, challenges remain, such as the need for emission filters and larger, safer tanks for hydrogen storage. The availability of green hydrogen is also limited, but the European Union and the United States are funding projects to address this issue. Despite the challenges, truck manufacturers and suppliers are embracing hydrogen combustion engines due to their existing infrastructure and supply chains. The technology provides an interim solution for lower emissions while waiting for green hydrogen to become widely available. Furthermore, trucks with combustion engines are easier for fleet customers to handle in the medium term because they are familiar with the technology. Overall, hydrogen combustion engines offer a viable and efficient solution for reducing emissions in the trucking industry.