Why is it unsafe to cross the road on a sharp bend or just below the top of a hill?

Crossing the road on a sharp bend or just below the top of a hill is unsafe because drivers may have limited visibility and may not see pedestrians until it's too late. The curvature and elevation can obstruct a driver's line of sight, increasing the risk of collisions. Additionally, vehicles may be traveling at higher speeds in these areas, making it difficult for pedestrians to gauge the approach of oncoming traffic. This combination of factors creates a dangerous environment for crossing the road.