You must not pass another vehicle if you see:

All of the points mentioned are critical safety provisions that drivers must adhere to while on the road.

When you encounter a school bus with red flashing lights and an extended stop arm, it indicates that the bus is unloading or loading children. Passing a school bus in this situation not only poses a significant risk to the children but is also illegal in most states, including Wyoming.

Seeing a solid yellow line in your lane signifies that passing is prohibited in that area. This marking indicates that it is unsafe to overtake another vehicle, often due to limited visibility or other hazards.

Approaching a hill or curve where visibility is compromised is another scenario where passing is dangerous. If you cannot see oncoming traffic, it is impossible to determine if it is safe to pass, which could lead to serious accidents.

Since all these scenarios indicate situations where passing another vehicle could either be illegal or dangerous, the requirement to not pass remains true for each of them. Therefore, understanding these regulations is essential for promoting safety on the roads.