[Yaristock]

At least if you get in a wreck in the Air Car it won't burst into flames due to a fuel leak. You'll just end up very cold. And whisker whipped. I don't believe shrapnel would be a problem because of crumble glass and the plastic body panels that are resistant to shattering. Heating wouldn't be expensive anyways because these vehicles are designed to have an onboard compressor ran of gas, its heat will either be expelled or used to heat the cabin. Just like the plans are to use the cold exhaust to cool air for the cabin.

edit: on a side note since this vehicle cleans the air as it move(in air only mode). Do you think you will be paid when you drive into London's congestion zone, since you removing some of the pollution? Your only adding to the road stresses; your not a zero emissions your negative emissions.