advantage of a loan from the department of energy, through the atvm program, it allows us to make those moves much faster than we otherwise would be able to. once -- without a loan from d.o.e., we probably have to go into production, be in production for five to eight years, to be able to generate enough retain earnings to be able to make that kind of investments. so the issue is one of timing, not one of desire or intent. >> washington, ben, you're on the air with phil murtaugh. >> caller: good morning. i'm an electrical engineer and an advocate for the electric cars, but people have brought up the current infrastructure of the grid. one of the other things that hasn't been addressed is the fact that currently our roads and bridges are supported primarily through funding from taxes on fuel. and electric vehicles themselves don't have a direct tax system. so how do you propose that we meet this need? >> i think that we all have seen that tax policy has changed over the years to suit the existing demands at those periods of times. as the industry changes, as the economy changes, tax policy will change to be able to come up with sufficient funding for the critical national n