Yes. We have to think about how we can use that energy and in what form can we store it. If you think of compressed air, you have to get it back into a compressor. So we have to send it back to electricity and to a compressor. I don't know. It's a very good idea that industry has used in the hybrid cars.
There's another area where we could use that. Some countries are working on how to get traffic flowing with fewer stops and starts. I've seen the work done in Finland, for example.