The hybrid electric technology is available now and is already in use in private vehicles. We were looking for greater use in commercial vehicles.
The hydrogen technology, when it comes about, which may be years away, will need the hybrid electric drive we're putting into our vehicles, so it will go hand-in-hand with hydrogen fuel cells or other fuel cells, when they come about.
But we're ready to go now. The industry is there. It's been tested and it's proven and the results are quantifiable right now.