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The biggest problem with hydrogen is still storage. Like gasoline, hydrogen is highly combustible (more so, actually). Unlike gasoline, hydrogen is a gas at room temperature. Thus, while gasoline in a car fire doesn't amount to a whole lot, hydrogen in a car fire could easily amount to bigass explosions. Even a small leak in the tank plus an open flame could make for one unhappy motorist.
Until a feasible method can be devised to store hydrogen onboard the vehicle in a nonvolatile form, it will remain completely impractical for private use regardless of how it's sourced.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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