Here's what I'd do if I were the government...
I'd buy $34 Billion worth of Car Carriers -- 18 Wheelers with the big engines Detroit makes so well (especially Ford, with the Volvo brand). The government would pay for these in cash, in advance. The auto industry would have its bailout and would live to face another day.
As for these Car Carriers, the auto companies would have a timeline they'd have to follow to design and build a safe, natural gas powered way to transport cars *and people*, building on the existing design of the Car Carrier trucks already running on the highways.
The Department of Transportation would have a parallel timeline they'd have to follow to set up stations along the Interstate Highway System, where people in their cars could be onloaded and offloaded.
Imagine a situation where you'd be able to take your car from the east coast to the west, but not have to burn all that petrol getting there.