KNOWLEDGE ILLUSION on Instagram: "Every highway sign you see isn’t just a piece of metal with paint — it’s precision-engineered to save lives. From design to installation, road safety signs undergo meticulous processes that ensure they are durable, visible, and effective under every condition. Follow @scienceplug for more forgotten inventions and mind-blowing engineering history. • Design & Planning: Engineers calculate size, reflectivity, font, and symbol placement to maximize readability at hi