New Jersey Air Brakes Practice Exam

When driving down a steep downgrade at a safe speed of 40 mph, to what speed should you apply the service brake?

30 mph 35 mph 25 mph 20 mph

Correct Answer:

35 mph

Explanation:

When driving down a steep downgrade at a safe speed of 40 mph, it is essential to reduce speed to maintain control of the vehicle and ensure safety. Applying the service brake to 35 mph strikes a balance between slowing down sufficiently while still allowing for adequate control of the vehicle. This decision is influenced by factors such as the gradient of the downgrade and the vehicle's weight, which can affect braking distance and effectiveness. Reducing speed to 35 mph allows the driver to anticipate any unexpected obstacles or changes in road conditions while still providing sufficient braking power to maintain a safe descent. Ultimately, slowing to 35 mph reflects a prudent approach to managing speed on a downgrade, promoting both safety and vehicle control.

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