Transcript for Delaware Tractor Trailer Crash Shuts Down Highway for Hours
And now to the other nightmare on the road. These images of a dangerous crash on I-95. Tonight, the dangerous culprit. Geobenitez on what caused it. Reporter: A massive tractor trailer striking another car and turning it upside down. The interstate was closed for four hours. Police telling us the driver fell asleep at the wheel. I-95 can be so dangerous, that there is a campaign to look out for tire drivers. Today's crash comes just a short time after Tracy Morgan's accident. Is it money or time? Well, they pay you for the mileage. Reporter: Drivers falling asleep are a top concern of the national transportation safety board. I don't recall doing it, dozing off or going asleep. Reporter: One solution, the technology like in this volvo. A visual and audible alert. Time for a break. It thought I was falling asleep. But critics say that systems like this aren't common enough yet. Amazingly, neither driver in the accident had life-threatening injuries. Thank you. And next to the breaking development from the border. Word that a helicopter belonging to Mexican law enforcement,
This transcript has been automatically generated and may not be 100% accurate.