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Length — continue driving for twice the lenath. �* , ., , length. but 'ust how safe is it havin: length. but 'ust how safe is it having an — length. butjust how safe is it having an electrical— length. butjust how safe is it having an electrical current i length. butjust how safe is it having an electrical current in the middle of the, both for drivers and the public? irate drivers and the public? we believe we _ drivers and the public? - believe we have a really safe system that you cannot pack and it will immediately shut down the road if someone tries to tamper with it.— tamper wi...

If someone tries to tamper with it. the demo road in lund will be here forjust one more year. this is one of the rails that we have on evolution road and being tested in a real—life environment and we take it back and we open it up to see how has it been affected by snow water, ice, whatever. now, new track is being made, ready for high—speed testing in belgium, and the start—up is looking beyond cities — to roads at ports and industrial sites. if you have a broad network of charge rails or an electrical road system, you don't have to carry on board all the energy you need. that means ...

Would've even seeing? >> yasmin, this is a snapshot of what we were seeing which is debris. the heavy machinery has been brought in to clear some of the road system that debris is going back to the grass. when we got here earlier, it was not just about everywhere. this debris has now been moving off. their trees that have been completely uprooted. of course if you go a little bit further down the road, what you will see in rolling fork is just houses that have been completely caved in. there are government buildings like the police department, the library, these public spaces that communities ...

This with tornadoes, when will people most listen to the tornado warning, how many minutes before the tornado comes, same with hurricanes, and you encountered this in your reporting, that will leave no matter what, and they have ridden out homes before and the models are overhyped, they're wrong, it is not that bad, you have to take the human psyche into consideration when you're doing this, and that's a hard thing to do. >> yes, absolutely. i mean there's a real challenge to figure out how to, you know, thread the need toll find out when to move people, and sometimes these are last-minute dec...

Higher, and hundreds of kentucky families are going to lose everything. this is sheriff joe engle in hard-hit perry county. >> the damage is just -- unlike anything i've ever seen. i think it's unlike anything that any of us has ever seen. these communities are nearly -- some of them's impossible to get to. the entire road system has been just washed away. the total infrastructure's been annihilated. i mean, we've lost electric. we've lost water. >> for more we're joined by michael mann the distinguished professor of atmospheric science at penn state university and author of "the new climate w...