In what situation should drivers reduce their speed?

Reducing speed at vehicle tunnels and blind corners is essential for ensuring safety in areas where visibility may be limited and where unexpected obstacles could be present. In such environments, a slower speed allows drivers to react promptly to any sudden changes in the situation, whether that be other vehicles, pedestrians, or other potential hazards. Additionally, the tighter turning radiuses and confined spaces within tunnels can make it challenging to maneuver, particularly in larger vehicles.

While the other options may also present scenarios where speed should be managed, the context of tunnels and blind corners specifically highlights the risk associated with limited visibility and the need for cautious driving. Understanding the unique challenges of these environments reinforces the importance of maintaining a speed that allows for safe navigation.