Where is it considered dangerous to attempt passing a vehicle?

Attempting to pass a vehicle on hills or curves is considered dangerous because visibility is often limited in these areas. When approaching a hill, drivers cannot see oncoming traffic until they are already at the top, which creates a risk of collision with vehicles traveling in the opposite direction. Similarly, curves can obstruct the driver's view of the road ahead, making it difficult to assess whether there is enough clear space to safely overtake another vehicle. Additionally, the unpredictability of vehicles coming around the bend or over the hill increases the chances of an accident, emphasizing the importance of waiting until the road is straight and visibility is clear before attempting to pass.