When exiting a highway with a heavy vehicle on a downhill curve, what is the best practice?

When exiting a highway with a heavy vehicle on a downhill curve, slowing down to a safe speed before entering the curve is crucial. Heavy vehicles, such as trucks, require more time and distance to stop due to their weight and momentum. This makes it essential to adjust your speed before reaching the curve to help maintain control and ensure safety.

By slowing down beforehand, drivers can enhance their ability to navigate the curve safely, reduce the risk of tipping over, and better react to any unexpected obstacles or conditions. Additionally, heavy vehicles have a higher center of gravity, increasing the risk of rollovers on sharp turns. Therefore, entering the curve at a safe speed helps in minimizing these hazards.

The other options involve either waiting until in the curve to make adjustments or increasing speed, which could lead to loss of control. Maintaining a safe and manageable speed before the curve is the most responsible and safe approach when handling a heavy vehicle under these circumstances.