Originally posted to the 2 stroke thread. My reply more appropriate here...
via Sunfish (2 stroke thread):
...Examples: Mum with three little kids in her SUV trying to fill it with liquid ammonia...
Full computer drive cars and trucks will soon be in daily usage so i would suspect that the 'refuelling', be that petrol, diesel, hydrogen, moonbeams, whatever, will be done automatically with no human involvement. With the computer cars accidents of all types will be dramatically reduced so the increased dangers of hydrogen may not factor into peoples concerns. As to aircraft usage...?
.