What is mean by retro reflective sign board?

A retroreflective sign board is a type of signage designed to reflect light back to its source, typically vehicle headlights, enhancing visibility at night or in low-light conditions. This is achieved through materials that incorporate glass beads or prism-like structures that redirect light. Retroreflective signs are commonly used for traffic control, safety warnings, and informational purposes, as they improve readability and safety for drivers and pedestrians.