Dramatic dashcam video shows a big rig plowing into cars on a highway in England.
In the video, the truck does not slow down as it then smashes into the back of a car.
The driver of that car then loses control and hits a mini-van.
The truck then comes to a stop.
Police say the driver of the tractor-trailer fell asleep at the wheel.
The driver was sentenced to 16 months in jail.
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Dashcam Video: Big rig driver falls asleep, crashes into cars