Georgia Commercial Driver License Practice Test

How many mph should you reduce your speed below the "safe speed" when braking on a steep downhill grade?

1. 3 mph

2. 5 mph

3. 10 mph

4. 15 mph

The correct answer is: 5 mph

When braking on a steep downhill grade, it is critical to reduce your speed to maintain control of the vehicle. The recommended reduction is 5 mph below the "safe speed." This allows you to adjust to the increased momentum that comes from driving downhill, where gravity can significantly affect your vehicle's speed. By reducing your speed by this margin, you enhance your ability to respond safely to any obstacles or changes in the road conditions that may arise. This reduction helps prevent overheating the brakes, ensures that you maintain better control, and gives you a buffer to react to unexpected situations, such as encountering sharp turns or other vehicles. Selecting this specific reduction ensures that you can navigate down the incline safely without risking a loss of control or accident.