Hydrogen is already used in commercial cars, so I guess there are solutions for tanks.
Those are on roads every day, and I didn't hear about one exploding yet.
'In properly designed systems these very small leaks do not present a problem as the tiny amount of hydrogen released will not be enough to cause a flammable mixture in air. Only when hydrogen gas can accumulate over time in a confined area will a risk of a flammable mixture or asphyxiation arise.'
Batteries can be unsafe too.
== Bring us Dabbsy back! ==