Plastic Safety Barriers Plastic safety barriers are lightweight units used to guide and control traffic and to protect work zones, roadways, and various sites. They are widely used in construction areas, roads, and public parking spaces. Description: They are made from high-density plastic materials (HDPE or equivalent) and are weather-resistant. They can be filled with water or sand to increase stability during use. Specifications: Material: High-Density Polyethylene (HDPE) or equivalent Usage: Construction sites, roads, traffic control, parking areas Colors: Typically red/white or orange/black depending on application