Correct answer
Inaccessible lateral barriers.
Inaccessible lateral barriers. The current classification lists safety barriers, parapets, motorcyclist protection systems and impact attenuators. Barriers protect against road departures at verges and central reservations; parapets are used on bridges and similar structures. Their protection does not guarantee preventing all injuries in every impact.
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Parapets.
Impact attenuators.
Inaccessible lateral barriers.
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