You are driving a heavy vehicle and must exit a highway using a downhill off-ramp that curves. What should you do before the curve?

You are driving a heavy vehicle and must exit a highway using a downhill off-ramp that curves. What should you do before the curve?

• A. Slow to a safe speed prior to the curve
• B. Accelerate to clear the curve
• C. Stay in the left lane
• D. Use the parking brake through the curve

Answer: (A)

Controlling speed before entering a downhill curve is essential when driving a heavy vehicle. A downhill slope adds speed from gravity, and a heavy vehicle has more momentum and a longer stopping distance, so you want to reduce speed while the wheels are straight. Braking hard or late as you enter the curve can cause weight transfer that reduces steering effectiveness, increases the chance of skidding, and in a heavy vehicle could lead to loss of control or rollover. If safe, use engine braking by downshifting to help manage speed without overworking the brakes, and then proceed through the curve at that safe, controlled speed. Stay in your lane and follow the ramp—the goal is to enter the curve at a reduced, stable speed rather than trying to slow down after you’ve begun the turn. Accelerating into the curve, staying in an incorrect lane, or using the parking brake during the curve would undermine control and safety.

Controlling speed before entering a downhill curve is essential when driving a heavy vehicle. A downhill slope adds speed from gravity, and a heavy vehicle has more momentum and a longer stopping distance, so you want to reduce speed while the wheels are straight. Braking hard or late as you enter the curve can cause weight transfer that reduces steering effectiveness, increases the chance of skidding, and in a heavy vehicle could lead to loss of control or rollover. If safe, use engine braking by downshifting to help manage speed without overworking the brakes, and then proceed through the curve at that safe, controlled speed. Stay in your lane and follow the ramp—the goal is to enter the curve at a reduced, stable speed rather than trying to slow down after you’ve begun the turn. Accelerating into the curve, staying in an incorrect lane, or using the parking brake during the curve would undermine control and safety.