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The boxes are to improve airflow - they are plastic and whilst tough, they won't stop a car. Behind them, are underrun or crash bars - that will stop a car - such as the ones in this video, why the Americans don't use them is beyond me, there is a campaign to change the law over there...
A couple of years back some guy was riding his bicycle down the Port of Dover and accidently got swepped up underneath a truck, and the driver didn't realise. Wasn't until the truck got to customs they found random pieces of body all around his trailor arches and wheels.
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