Hydrogen cars are probably a dead end. Not enough benefit for the infrastructure costs required. I think the future options will be EV and synthetic gas. As batteries improve further, EV will have a lot of advantages. But it will only be available for those who have personal garages. For everyone else, it makes more sense to create gasoline instead of building an entirely new hydrogen infrastructure. There is already technology in early stages that can create gas from just electricity, water, and CO2 from the air. It seems refining that technology is a much better idea than trying to use hydrogen.