from what I've read on this. and by looking at the damage, i don't think the first reponders had to touch the roof to get the driver out. as i think it went under the trailer opening the car like a tin of baked beans.
Looking at the photo the semi does seem to have the safety under run barrier on the trailer designed to stop exactly that type of thing.
I can't remember if they're required here (and can't remember seeing any) but they have been mandatory in Europe since 1980. I've never been sure if they'd stop a car at 110km/h though.
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