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CAT (Compressed Air Technologies) worked on this for a bit. They even had a few driveable units.
Problem is getting several 3000-4500PSI air tanks to pass crash testing.
We SCUBA dive and will tell you, the guy with the bed or trailer full of the groups tanks would not want to be plowed by a truck.
Don't think they will ever get on past the NHTSA here.
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