I seriously doubt you'll ever find yourself behind a tanker of liquid hydrogen. Hydrogen cannot be liquefied by pressure unless its temperature is 33 deg K or lower (in old money about -240 deg C). And as I pointed out above, it leaks out of everything. It cannot be stored efficiently. Liquid hydrogen is plenty dangerous, but mainly because of its temperature; and the energy involved in liquifying and keeping it liquid is immense. Complete non-starter as a mass-market fuel.
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