What should a driver do if they encounter a warning sign for a steep hill?

When a driver encounters a warning sign for a steep hill, the appropriate action is to reduce speed and prepare for a descent. This sign indicates a potential hazard due to the incline, which can affect the vehicle's handling and braking capabilities, particularly for larger vehicles like trucks.

Reducing speed ahead of the descent is crucial because it allows the driver to maintain control of the vehicle, prevents overheating of brakes, and minimizes the risk of losing traction or control on the slope. It prepares the driver to respond to any unexpected situations that may arise while descending, such as changes in road conditions or the presence of other vehicles.

In contrast, ignoring the warning sign does not ensure safety and is unwise, as these signs are designed to caution all drivers about potential hazards. Similarly, proceeding at normal speed could lead to difficulties in managing the vehicle's speed given the conditions of the hill. Accelerating to coast down may seem tempting but can lead to instability and loss of control, particularly when a steep decline requires careful management of speed and braking.