Older Indian residential areas and urban slums feature highly dense, narrow grid layouts with sharp 90-degree intersections. Pedestrians, cyclists, and two-wheelers frequently collide at these blind corners because high walls completely block the line of sight. Traditional convex mirrors are easily stolen, vandalized, or blurred by dust and rain. Students can innovate passive, durable mechanical warning systems, ground-pressure alerts, or periscope-style optical reflectors built straight into building corners to alert oncoming traffic.