The Safety Roller is designed to replace the steel we currently place along the sides of roads to prevent accidents. It does this in two ways. First the rolling pins along the barrier absorb the shock energy from impact. Second, the pins, which can spin, then convert the shock energy into rotational energy. It has been claimed to be recyclable, eco-friendly and flame retardant. By the way, this isn’t just an idea to simulate a possible technology. It has been deployed for use to numerous countries already.
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Tome of Trovius 