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No, it's not :)

Where would you get the energy to split the water? Why not just use that energy directly :).

The idea is to use the water as an energy carrier. You split the water into H2, than use that to power a car producing water as the only output.

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>Where would you get the energy to split the water?

From a battery.

If cars produce water as exhaust, will there be constant rain showers on congested roads?

They already produce plenty of water in the exhaust.

Right, I did a simple calculation, for the same distance driven, both gasonine and fuel cell cars produce pretty much the same amount of water, about 100ml/km. Only difference is, with gasoline that water is mostly vapour, so it doesn't get on the road so much, fuel cell cars have small tanks not to wet the road constantly.

Watch a YouTube of a hydrogen car review. They produce maybe a cup of water for a consider amount of driving. It’d evaporate relatively quickly.

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