I think it will be many years before Hydrogen fuel cell vehicles make a REAL impact on the driving public. Nothing is going to happen for at least 5-10 years with production and development of fuel cell stations that you can fill up at. Transporting and storing the liquid hydrogen also will be expensive..........much more so than gas is, i imagine. Liquid Hydrogen is very cold!! I remember liquid oxygen is very cold(-200+), from my years in The Air Force.