The hydrogen infrastructure requires to be built from scratch. New fuel stations (of course they can reuse existing locations), the technology for fueling hydrogen is way more complex and very different to gasonly. New trucks. This is transporting very voilatile gas at about 1000 bar pressure. And it requires the trucks driving around, which was the main thing I was speaking about, while the elecricity flows over the existing networks. It also requires more truck loads of hydrogen than gasoline to supply the same amount of car mileage.