Zoneguard® is a proprietary temporary steel barrier developed by Hill and Smith. It has been successfully crash-tested in accordance with NCHRP 350 Test Level 3 and 4 and MASH Test Level 3. A cost-effective alternative to traditional concrete barrier, made of long-lasting galvanized steel. Zoneguard® can withstand nuisance impacts and regular movements with little to no visible wear-and-tear.