Which sign indicates it is unsafe to pass another vehicle?

The sign that indicates it is unsafe to pass another vehicle is the "Do not pass" sign. This sign serves as a clear warning to drivers that passing in that area is prohibited due to potential hazards. It is typically placed in areas where visibility is limited, such as on curved roads or near intersections, where passing could lead to dangerous situations. The presence of this sign is a crucial guideline for maintaining safety on the road, as it helps prevent accidents that could occur from attempting to overtake another vehicle in inappropriate conditions. It reinforces the importance of adhering to traffic laws and being cautious in potentially dangerous driving scenarios. Understanding and obeying this sign is vital for all drivers to ensure safe traveling for themselves and others on the road.