The cars are scrapped it is a requirement of the bill.
Important Things to Know
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Your vehicle must be less than 25 years old on the trade-in date
Only purchase or lease of new vehicles qualify
Generally, trade-in vehicles must get 18 or less MPG (some very large pick-up trucks and cargo vans have different requirements)
Trade-in vehicles must be registered and insured continuously for the full year preceding the trade-in
You don't need a voucher, dealers will apply a credit at purchase
Program runs through Nov 1, 2009 or when the funds are exhausted, whichever comes first.
The program requires the scrapping of your eligible trade-in vehicle, and that the dealer disclose to you an estimate of the scrap value of your trade-in. The scrap value, however minimal, will be in addition to the rebate, and not in place of the rebate.
Check this site frequently for the most recent updates from the government.
Sorry Mikes Toy this is from the gov. website CARS.gov