An expandable safety barrier is a portable, foldable barricade designed to temporarily restrict access to hazardous or restricted areas. Made from durable plastic or metal with an accordion (scissor) design, it extends and collapses easily for quick setup and storage. High-visibility colors (usually yellow) with reflective strips improve safety in low light. Commonly used at construction sites, warehouses, roadworks, maintenance areas, and around open pits or equipment.