Congress passed the cash-for-clunkers bill last night that will give consumers vouchers of $3,500 to $4,500 to trade in an older car for a more fuel efficient one.

The measure was passed in the Senate as part of a war funding bill and is expected to cost $1 billion. It will go into effect as soon as President Obama signs it, as he is expected to do, and the program will last until November 1.

In that time, it is expected to spur about 150,000 consumers to buy new cars, according to Automotive News. Dealers must certify that old cars traded in for the voucher will be crushed and not resold.

If you’re considering buying a new car and have been waiting for the federal incentives, we published a list of Consumer Reports Recommended cars that qualify for a voucher. As for the most worthy cars to send to the crusher? Check out our list of best gas guzzlers to junk.

—Eric Evarts

Update: President Obama signs Cash for Clunkers bill.
For more information on the Cash for clunkers program, see our guide.